If you're talking about reality, then it is PS2, hands down...like dude said they're still making games for it, and only recently stopped producing the system.
Personally, however I'd go with Game Boy. Thanks to the GBA's compatibility with the entire library I played the shyt out of older titles well after their release.
Personally, however I'd go with Game Boy. Thanks to the GBA's compatibility with the entire library I played the shyt out of older titles well after their release.