It's really hard to recommend one specific laptop with that little info. There are many things to take into account when buying a laptop.
1) Most importantly, the specs. You say you want to run Unity, and that it should be "fairly high-end" (and enough to last a few years, presumably for gaming). If it is everything you need, then the most important part will be the GPU. Right now, the GTX1060 is a pretty good choice for laptops - it can play pretty much any game with high details/1080p at 60fps, and can be found in slim machines (like the MSI gs63vr, Asus gl703vm, Aorus X3 Plus, Gigabyte Aero, or Razer Blade). If you feel like you do not need high graphical quality - a GTX1050ti would be a very good value (albeit less future-proof of course). If you wish to play at higher resolutions (1440p or 4K), and do not mind bulkier designs, then you could choose a machine equipped with a GTX1070 - or even a GTX1080.
A laptop equipped with a 1050ti will usually cost between $800 and $1000; one with a 1060, between $1000 and $1500; and for laptops with a 1070 or better, you should be ready to spend more than 1500 dollars. In most laptops, the GPU cannot be upgraded, so choose carefully before buying.
On a side note, there are two versions of the 1060 - one with 3GB of VRAM, and one with 6GB. If you get a laptop equipped with this GPU, having 6GB of VRAM will definitely make it much more future-proof.
The CPU is also an important part of the specs, but usually the CPU equipping gaming laptops with the GPUs listed above will be more than enough for most games to run smoothly. Although I have yet to see a gaming laptop without one, you should check if the CPU is an i5/i7 from the HQ series (higher power consumption than the U series, but much better performance). Like the GPU, CPUs can extremely rarely be upgraded.
The disk space is also something to consider. Do you need lots of storage? Does it just need to be fast? Both? Most gaming laptops come with both a M.2 slot (used for SSD - very fast type of drive that costs a lot) that a 2.5" SATA slot (mostly used for HDDs, that are inexpensive but way slower and less reliable). A 120GB SSD (where you would install windows and your most frequently used softwares) + 500GB/1TB HDD (for games and more general storage) is usually good. In most laptops, the 2.5" and / or M.2 drive can be replaced, if you need a higher capacity in the future or if it fails.
Finally, for the RAM, type and speed shouldn't matter in pretty much all cases. The capacity is what you should be looking at; for a gaming laptop, 16GB is good. For more general use, without heavy multitasking, 8GB will be enough. In *some* laptops, RAM can be replaced and upgraded, but it is more and more common for it to be soldered in thin machines. You should check before buying, as upgrading to 32GB could definitely help in a few years.
2) Design (and build quality). Do you want a thin laptop? Do you not mind a 4kg+ bulky piece of hardware that you can barely put on your lap? Do you care about the case being made out of plastic, or do you want a machine with a more premium feel that's 100% aluminium? And do xXx_3dg3g4m3l0rd_xXx designs annoy you? While it's not something you'll notice while using it most of the time, it can make a big difference if you travel a bit.
Acer usually make the cheapest laptops in terms of build quality. Asus, Dell, HP and MSI are usually a bit better, and use things more premium than plastic on some models. Gigabyte/Aorus and Razer are the premium choices, and use pretty much exclusively metal cases.
3) Screen. Do you want a TN or IPS screen? Does it need to be bright? Do you want these silky smooth 120fps? Will you be doing professional editing and need good color accuracy? Do you "just" want a 1080p screen, or a 4K one? And do you want it to have G-Sync? The best thing to do here, as pretty much all laptop models are different from each other in that regard, is to check individual reviews for models you're interested in and choose accordingly. 4K is not really important (in my opinion) for a gaming laptop, but G-Sync is definitely something good to have if you'll play a lot of games.
4) Keyboard. It's impossible to tell if you're going to like a keyboard from pictures alone, but you should at least consider if you need backlight and / or a numpad. While it's a detail, you might like shortcut keys from one manufacturer more than the ones from another.
4.5) Trackpad. On most laptops, they tend to be much better than they were a couple of years ago (the scrollbar atrocity is pretty much extinct now), but most of the time you'd probably want to buy a mouse.
5) Battery life. Do you want a long battery life (10+ hours)? Or will your laptop be plugged-in most of the time?
Unfortunately, most gaming laptops come with average battery at best. The battery life will be affected by the specs (in general, the more powerful it is, the shortest the battery will last), the screen (higher resolutions, and especially G-Sync, which prevents the iGPU from being used), and of course, the battery capacity. Again, checking review sites is pretty much your only option here. Usually, gaming laptops last between 2 and 5 hours, while ultrabooks and laptops without fancy specs can last for twice as long.
6) I/O. Do you only one USB-C port? Or do you need still need the good old ethernet/USB-A? It varies heavily depending on the model, so you should consider what ports you need, and in what quantity.
And finally 7) Budget. It's hard to recommend anything without knowing how much you're willing to spend.
While, again, it's hard to recommend a specific laptop with pretty much no info, these are very different models that could help you decide on the type of thing you want.
https://www.amazon.com/dp/B074Q54GSR Acer Nitro 5. mid-entry level gaming laptop. Nothing groundbreaking, but good value if you don't think you'll game much.
https://www.amazon.com/dp/B076D95R1P/ Asus gl703vm. Very thin laptop with a GTX1060. Good specs for the form factor, and very good screen,
https://www.amazon.com/dp/B074XLYVHV MSI gt73vr. Big, bulky gaming laptop. Has amazing specs (GTX 1080), but does not come cheap - both in price and in weight. (Can you even call this thing a laptop?)
https://www.amazon.com/dp/B06XFG7157/ Dell Inspiron 5000. Entry-level gaming laptop. Very average specs for a gaming laptop, but still a good value for the money.
https://www.amazon.com/dp/B0788ZC44Z/ HP Pavilion 15. Not a gaming laptop, but might also be what you're looking for. Thin, light, and good battery. Can't really play games, but should still be a great general-use computer in a few years.
