If you have the money the March is a better scope, better glass(especially in glare), better turrets(more crisp), more compact(March is ~1.4" shorter), and the biggest difference is the amount of elevation; only 68 MOA for the VX-6 and a whopping 120 MOA for the March, strange as the VX-6 has a 34mm tube(less choices of rings also). Weight is about the same.
The March does not have an internal level.