animaniac318
Sega also had Gamegear, which is portable but was crap compared to Gameboy.
I've gotta disagree with you there; the Game Gear is actually far superior in terms of technology... it has a full-color, backlit screen (Nintendo didn't do that until the GBA SP many years later), and there was even a TV tuner attachment you could get for it so you could watch actual live TV channels.
The real reason it paled in comparison sales-wise is largely because of lack of consistent exposure through advertising (Sega never learned that lesson, did they?), and where the two companies were at in terms of the consumer market--and also... it goes through a lot of batteries, lol (there's a wall adapter you can get to plug it in though). I love my Game Gear, though. It actually has some pretty good games that make it worth it for that alone, honestly. But I'm a collector, lol