GP32 SNES emulation is better (and cheaper) than GBA SNES emulation. SNES on GBA doesnt run many games and doesnt run them well, with bugs. GP32 is infinetly better than GBA for emulation. As for homebrew games, i dont know.
I think that the only system that is emulated close to or better on the GBA is PC-engine. It is not a hardware thing as the GP32 could absolutely destroy the GBA for PC-engine emulation. It has to do with the fact that the source code was lost for the GP32 version so it is dead. While on the GBA you have FluBBa's brilliant PC-engine emu that is updated frequently. I think the source is available if someone wanted to port it. FluBBa himself only does emus for Nintendo hardware like GBA and DS so unfortunately these is a slim to none chance that he will port it himself. Other than that GBA is pretty much weaker for emulators.
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