There are a bunch of different ways to look at refractive surgery. If you are involved in any type of activity that may involve head trauma or high winds (sky diving, football, rugby or any other type of extreme sport) PRK (photo-refractive keratotomy) is the way to go. From an aviation standpoint that is the only approved type of refractive surgery, as well as for diving/EOD/BUDS.
LASIK (laser in-situ keratotomy) has the fastest recovery time and is the least painful (I've had LASIK myself). It is not approved for aviation (pilot, navigator or aircrew) or any type of special operations due to the risk.
The difference between the two, in LASIK a flap of the cornea (the outer layer of the eye) is cut and pulled back before the laser burns away part of the eye to correct the vision. There is a possibility that the flap can pull away even after its healed, as the cornea will never heal back as strong as it was before being cut. With PRK they just burn away the outer layer of the cornea to correct the vision. It takes a little longer to heal, as its basically just an open wound.
So its really a personal choice, PRK is cheaper than LASIK, and PRK can correct vision that LASIK can not.