I have used both systems and have found clinically no difference in my outcomes. Both of them have similar safety profile. If you find a surgeon that you are comfortable with, then don't let which is these two laser he uses dissuade you. You will have the best of technologies...
It depends. In the early going after lasik, the refraction can change - sometimes dramatically. So, you want to wait for 2 to 3 months to let things settle. If you don't and are re-treated too soon, you may end up with an over-correction. To answer whether or not...
This would depend on whether you are -7.50 (myopia or being near-sighted) or +7.50 (hyperopia or called far-sighted). LASIK can treat myopia up to about -15.00 safely in patients with thick enough corneas.
If your corneas are thicker than 550 µm and you are otherwise ...