You seem like you've decided already, but here's something to think about as well:
Sky3DS works as is, but Pokemon SuMo do not work on it. This might be fixed later, but it's been a while already.. Other soon-to-be released games might not work as well. In addition, with Sky3DS you will be using roms. These roms have a private header on them, and each game cartridge has an unique one. If you're using a downloaded one, and everyone else is using the same one, then it's pretty obvious that going online with such a rom would get you banned.
A9LH+Luma will let you stay on newest FW always, and install variety of Homebrew applications, of which the most popular I'd imagine is freeShop. With FS, you can download all games that can be found in eShop - but for free. These games can also be played online because CIA's do not have private headers in them at all, so there's no way for Nintendo to tell whether that game is legit or not. Zero chance of getting banned. And well, technically freeShop games ARE legit since you're downloading them from Nintendo's servers anyway.
I'm sure there's wayyyyyyyyyy more pros for A9LH but eh, the choice should be obvious. Idk why Sky3DS is even a thing people use anymore - it's just trash man. I almost feel ashamed that not even a month ago I was still using Gateway myself .. just .. so .. bad.
Its only useful for using userland homebrew on a legit console until someone cooks up a kernel exploit.