I personaly like seeing the images side by side, instead of one on top of the other.
But I disagree that there arn't any good 3d games/racers on GBA. Good 3d Racers: V-Rally 3, Stuntman (but it is kinda tricky), Top Gear Rally (even though i don't like the tracks), NFS:U (except it has the corner issue... but i got over that). Good other 3d games: astrix & oblix xxl, 007 Nightfire, Ecks vs Sever 2 Balistic. 3d games on the GBA are possiable... but among the good 3d releases, there's more bad releases that arn't very well thaught out or they just cut corners and end up with a crappy game (look at MoH:Underground... eeew.)