The first system I modded was the original Xbox and have been doing systems ever since. Xbox, PSP, PS2, Gamecube, Wii, Wii-U, Switch, Xbox 360, PS3, PS4, 3DS, etc, etc. I own and have done them all. The only system to come out that I haven't modded is the Xbox One (I don't plan on owning one).
Out of all the mods I've done, I have to say that the PS3 and Wii-U have to be my favorite systems. Such a wealth of great games (PS3 plays PS, PS2, PS3, and retro games. Wii-U plays Gamecube, Wii, and Wii-U games)....I'll take those two systems over current gen systems any day!
I did remove the PS4 mod a while back and updgraded the system. I wasn't willing to keep the system on lower firmware just to play "backup" and then not be able to enjoy games like Spider-man, etc. Perhaps one day the PS4 will become an open system like the PS3 but I'm perfectly fine with leaving the modding off of that system.