Here's a thread with some relevant comparisons to your questions:
http://www.gasgasrider.org/forum/showthread.php?t=23186
I've not ridden the '18 Gassers, though I am dying to try one out. I have ridden a couple TX 300s and they are really good bikes. Good like, I need to give this bike back before I go out and buy one, good. Very smooth and light and I was quite impressed with the stock air fork. That said, the author of the thread I linked gave the nod to the gasser, so that's saying something. If I were in the same position it would be a very tough choice. I'd say the biggest draw back that I can see of the gasgas compared to the Husky is the e start, which seems rock solid on the austrian bikes, seems to be a bit mixed on the gasgas, but again, I have no first hand experience.