In the interest of not citing every console I've ever owned, I'll go with the ones I currently have in my posession and could plug in or play within 10 minutes:
Nintendo:
SNES
Gamecube
Wii
WiiU
DS
3DS
Playstation:
PS1
PS2
PS3
PS4
PSP
PSVita
Microsoft:
Xbox 360
Xbox One
PC: Steam
Laptop
Desktop
Samsung Galaxy S6
Right now, the PS4, WiiU, Xbone, and SNES are Hooked up, with Wii, 360, and PS3 all within reach to hook up any time. Vita and 3DS are both in special cases on my desk underneath my Laptop, ready for play at any time. DS and PSP are both in cases on my shelf, waiting for me to charge them and play.
So yeah, got a bit. I would list favorites, but that's just fanboy flame war Fodder.
SNES is the Best, but PS4 gets the most use right now.
My Console Library:
PS5, Switch, XSX
PS4, PS3, PS2, PS1, WiiU, Wii, GCN, N64 SNES, XBO, 360
3DS, DS, GBA, Vita, PSP, Android