Recently picked up a new premium soft top off a 2013. Been running it for a few months now. It looks/feels different than the black diamond. To me, the twill is more cloth/denim like in appearance and touch. Not saying it is better than the other, just my opinion on appearance of the fabric.
As for function. I came from a hard top and heard a lot about wind noise etc I'd experience with a soft top. To me, there is not much difference between my hard top and the newer soft top. Super quite and no noise/wind issues at all. The newer fabric is marketed as part of the reason???
Not sure I'd pay anywhere close to the $1200+ they sell for new. But I got a brand new one still in factory wrapping on CL for less than 5 bills. Came with all parts/brackets and nothing extra to buy. Well worth it at that price as the family loves going topless.