Which is better for the health of your teeth Invisalign or Braces?

Ok I had Invisalign. They don't intentionally take off your enamel. They have to make room for your teeth to move if they are too scrunched. So they take this tiny little floss like strip that is like sand paper and put it between your teeth to make room. My doctor told me before he did it that it may seem like the enamel is coming off but it barely will take it off. Invisalign was easy and it is now almost the same cost as regular braces.