This is a port of the SNES game for the GBA and this is 100% the same as it released back in 2002. But this version is known to be buggy and they were not fixed in this rerelease. This includes any parts such as objectives being completed but no goal appears and mechanics in levels not working right. There's some minor improvements such as Aero's sprites updated, enemies are easier to take down, and spikes aren't instant death. There's of course the usual downsides for SNES to GBA games like screen crunch and refused audio quality but at least there's a built in save feature which all the SNES games lacked. Extra content is similar to the rerelease of Aero 2, manual, save states, achievements, cheats, etc. So yeah get the OG game than this unless you want some nostalgia or if you're an achievement hunter.
Fun fact: The prototype of this game uses GBA Earthworm Jim music "Down the Tubes"
