mGBA is among the most up to date emulators for GameBoy Advance. It can emulate pretty much any game for the platform. Furthermore, it also supports a few games from the classic GameBoy, as well as GameBoy Color. The emulator is more advanced than other similar programs because it is still being maintained. New versions pop up every now and then, while regular updates occur for free over the Internet. In other words, the team behind the emulator actually takes reports and suggestions into consideration.
Apart from being up to date, mGBA has also gained notoriety for its exquisite accuracy. It is more accurate and precise than other GameBoy emulators, but it also brings in some modern features that old and abandoned emulator projects lack. Apart from fixing bugs regularly, the team behind the emulator also provides solutions to bugs that cannot be handled yet. It is also worth noting that the emulator can be downloaded for free.