It's all a matter of how comfortable you feel in an app, and well how much money you're willing to spend. For example I'd love to get Vue 6 Infinite. The key features I'd really like are Ecosystem painting and Wind. But for me it's just out of the question to spend $500 just to add these features. Hexagon however is nicely priced and a lot of people are happy with it so I may check it and get back into modeling.