I wouldn't personally say it's better, so I can't speak for OP; but generally people that use FASM prefer it for two reasons: 1) it's self-compilable (vs NASM,

I wouldn't personally say it's better, so I can't speak for OP; but generally people that use FASM prefer it for two reasons: 1) it's self-compilable (vs NASM, which is C) and 2) they like its macro system.