Aaaaaaargh I'd typed out a big post & when I hit send itall deleted!!!
Ok here goes again...
10pts ZX Spectrum - Still can't believe how much gaming goodness can be packed into a device so small with technology from 35 years ago.
9pts Sega Mega Drive - The moment for me that arcade games came home.
8pts Atari 2600/VCS - My first love and amazing that I'm still discovering playable games from a machine almost as old as I am.
7pts PSP - The greatest handheld of all time, even before cfwing it.
6pts PS2 - Bought it for the DVD player and backwards compatibility. Kept it for the huge library of diverse games.
5pts Wii U - Can't believe this wasn't more successful, when the touchscreen is used properly it is an incredible device.
4pts Atari Lynx - The greatest handheld of all time unitl the PSP came along.
3pts PC - Basically used for emulation, Championship/Football Manager and Civ 2. I'm sure other games were available.
2pts Gameboy Advance SP - A portable SNES. Nice.
1pt XBox - Basically a PC without the complicated graphics chips sound cards and complicated thingymabobs.
For fairness I've only gone with systems I've owned. If I'd ever owned a decent spec PC then that'd probably be higher. I'd probably also have found space for a PC Engine, PS3/4/Vita, XBox360/ONE.