I play Mother 1 on my repro cart, EarthBound on my cartridge, and Mother 3 on my flashcart.
Hmm... well...
I play them all on GBA, actually.
Mother 1+2 and Mother 3 official carts.
Though, my SP is busted, so there goes that. Well, it's only, like, 30 bucks or so now, most likely, anyway... So I guess I'll get a new one soon.
I play on the Wii