Despite never actually trying to do the AGB_Firm method I would like to add my input.
I am using GPSP and playing Pokemon Leaf Green just fine as well as Legend of Zelda Minish Cap. Everything is working as it should except for Multiplayer and Linking.
I haven't encountered any issues unless it's something wrong with "the most bleeding edge nightly build" which I just rollback.
I hear that the graphics are much better using GPSP.
But it sounds pretty cool to think that with AGB your GBA game roms are running exactly as on a GameBoy Advanced.
I wonder how multiplayer and linking will turn out and if there will be any progress made when Pokemon Blue and Red are released for Virtual Console with multiplayer linking.
So, at the end, AGB_Firm vs GPSP? Which offers a better experience? What are we ultimately comparing?