Coils are fine, they tend to be plusher but you need a coil specific to your weight (fine if your ‘normal’ but thinner or fatter ppl usually need a different coil from std) and tend to be heavier overall fork. Air forks tend to be lighter and can be matched to a rider weight by mean of more less pressure in the fork.
Just watch that there enough steerer for the new frame, before embarking on swapping them. Not a difficult job otherwise, assuming you don’t need a different brake adapter (not difficult just more expense)
