Netvault vs Appassure/Rapid recovery?

Anyone know the major differences from Netvault and Rapid recovery? Btutuapp oth seem to do nearly the same, but I bappvalley elieve netvault may be more for enterprise, with support for many many more machines and different OS? Or are there other things? We currently have appassure, pretty happy with it. But Dell called and was talking to upper management and mentioned netvault, so now we have conference call next week.