I like the form factor of the original GBA best, it's much more comfortable than the SP. But obviously, the screen is not good, so it needs an IPS mod. I haven't modded mine with an IPS screen yet.
The Analogue Pocket also deserves a mention. Haven't been able to get my hands on one, but seems like the ultimate way to play GB/GBC/GBA.
The Analogue Pocket also deserves a mention. Haven't been able to get my hands on one, but seems like the ultimate way to play GB/GBC/GBA.