Probably the Wii. It had some of the best games I've ever played on there. Too bad the Wi-Fi connections got shut down, but there's always Homebrew! (Flashbacks of bricking my virtual Wii. I am dead inside)

 

Probably a modded Wii U. Can play pretty much the entire Nintendo Library(Emulation, VC, Nintendont for GC, Wii, etc) plus the Wii U titles. Along with other console emulators and VC.

 

Since PC isn't an option, I'd go with PS4.

I love me some older games, but I'm sure there will be enough content on the PS4 by the end of its life to keep me entertained for the rest of my life. There are enough PS2 and PS3 remasters to keep my nostalgia going as well. I'd miss a lot of Nintendo games, but there are enough similar games on the PS4 to those titles to scratch that itch.

 

Can I choose arcade games?
I feel not, for the same reason as PC, but then could I just choose like one specific arcade system?
Also if so you should be able to choose a certain PC system or OS since it would be basically limited to the games of the time if you ban upgrades and emulation (no way I'm playing dos games on windows 10 natively )

well my choices, based on if they're allowed or not:

PC (if a certain system/os, pentium III with win 98)
Arcade (if a certain system, JAMMA. If that's not allowed, then just Taito games)
DS. (If GBA ports are allowed like Phoenix Wright)
GBA (If Bubble Bobble Old & New is allowed)
and then SNES.

other close systems are Gamecube through Wii U, PS2 through PS4, OG Xbox, PSP and Vita.

 

PS4

 

3DS. The cutest form factor.

 

Are there universal power chargers in this new dimension?

Btw, N3DS.