What a great question… and I’m sorry to disappoint you, but really, I don’t have a particular favorite brand! I pretty much like them all.
As for me wearing flips, it’s not really the brand I get picky about, but the size. Since I have somewhat small feet (US 8), the straps on most flip flops are way to think for me. So I tend to prefer to wear skinner strapped flip flops… which can be a bit trickier to find. For instance, I had to go to the Abercrombie store (which is their teen/tween line) for flips, as the proper A&F ones just swallowed up my feet.