It depends on if you want a long, or short frame. As there is a big different between the two. I have a Zona, from a T-Pro. And it's a lot longer, but feels so nice on the backwheel etc. Zona - Onza. The first lot of T-Mags cracked and caved on the front bashplate, but i'm certain that Onza strengthened that with a gusset. Any frame can dent, there's a small one on my Zona's downtube where I knocked it on a wall..It happens. Choices of frame are personal preference. Try and have a go on a T-Mag, and a Zona (or Zoo...) and see if which one you prefer.