I think Carierre is what DS did for 6 months before switching (per plan) to traditional brackets. It worked well for him and seemed to do exactly what the orthodontist wanted it to do. We actually had DS's braces removed a bit early because we had to move, but he still wears his retainer 3 years later, and his teeth seem good.
DS has ASD and struggles with many things, but the Carierre was pretty uneventful for him. I think he liked that part much better than the time with traditional brackets. I don't have any experience with Invisalign.
DS '04 "Boogaboo"
DD '08 "Lilybear"