Yeah, answers should be there.
But while I like my old Kayline and it's tight as I think you can get one, you're never going to get completely away from some flapping. Mainly in the warmer times, as the material makes it's HUGE transition from cold-shrunk, to hot-stretched and everywhere in-between.
Normally though, it's pretty quiet, tight, air-tight, and easy on the senses.
They probably do let more ambient noise into the cabin, but compared to a bare (non lined, non insulated) hard top, it's less noticeable and less "tinny" sounding inside.
And when it comes right down to it, either the Bestop, or the Rampage, or maybe even the BC Broncos tops, are all about the care taken during the installation.
Good luck in the hunt and eventual decision.
Paul