I went with BD because for the price of the Twill, I could buy the BD and then later get the replacement fabric "replace-a-top". So even if the twill lasts twice and long, it would still be the same price and I'd have brand new fabric half way through. Also, some people said its harder to clean dirt and mud from the twill.
I do notice now it seems they stopped carrying the regular NX. All they show now is the "All New Trektop NX" which looks to just be the same as what they used to call the Trektop NX Plus (with the new sunrider and glide windows). For the 2dr, the BD is about $50 more than the Plus was though. And $150 more than the old zipper window NX. Which also means I may have trouble buying that replace-a-top later. >.< but its a summer top only for me and it seems like it will last a long time. Glad i bought it before it was gone. I specifically DIDN'T want the zipperless glide windows so i could roll them up and store them in the back. Jealous of that new self folding sunrider though.
EDIT: on second look, Qtech has them $50 cheaper than Bestop. So I guess the new NX is the same price as the old NX Plus. which is good since it seems to be the same thing.