Hi all. I am learning C (slowly) and I am wondering which language is best for GBA development. Is it worth the extra learning to use ASM over C? What are the advantages of each? Thank you for your time, all Da_Bob

For hobby development C is fine. The GBA hardware is taking most of the load for graphics (sprite) manipulation. The only reason I can see you needing asm is if a) you are doing professional work and need to squeeze every last drop of performance out of the GBA (both in speed and usage of limited memory) or b) you are doing some custom graphics effects (3D or something else not done by the hardware) in which case you would want inline asm for those functions.