I wish the Whirlwinds had a better handle material, they do fit nice though. I don't think I have a most comfortable folder but just now picking up my stag BenchMark Diamondback felt right. I've a well worn rubber handled lockback from Seki with a birds head shape that was always a comy user (I never did find out who made the "Ultrablade")
Fixed, Randall commando handled #2. The Taipan is nice but I like anything with a little palm swell to it. Really, the handle that's most comfortable is the one I made with a bit of similarity to Randall's border patrol profile. Partial to subhilts too, or anything with stag.
Cheers
GC