Both of the lasik systems that you list are excellent. I would not base my opinion on which of these systems are being used. Rather, I would recommend that you look into the reputation of the doctor. This is by far the most important aspect.
Although LASIK can be performed off label, I wouldn't do it for a 13 y.o. My main concern is that younger people, especially those under 18 years of age, have very placid corneas. Placing and incision in this young of cornea while making the LASIK corneal flap puts the cornea at risk...
You do not need to treat the scar unless it is blurring your vision. If you have correction that you want to fix, then PRK would be the best option as it will reduce the scar and at the same time fix the vision correction. Sometimes it is not possible to perform LASIK with a...