In the antenna world, at those frequencies, without extremely expensive electonics, bigger is always better when it comes to antennae and/or reflector. The X2 is the largest of the portables as far as I know.
I have the X2 and it has performed flawlessly. I can also attest to it physical strength after a Ram 2500 drove over it while he was backing his trailer in, took a licking and continues ticking. Slightly dented, but works fine.
Haven't really been out in storms with it, but I have no fear it will perform as well as any if not better, INHO.
Paul