drawing on surface is better in my opinion in some instances

Better import on .iges, .step
Smart object snaps, construction lines

But there few important features missing if are an advanced surface modeler. I hope is gonna be the main focus for the next few releases...
Also OS X will be more than welcome. Which is the main reason for me to consider Rhino. I wish McNeel was using OS X as an experimental platform to address core problems which are the main reason why Rhino users welcoming MoI. IMO

A hidden favorite of mine (that hasn't been mentioned yet) is the chamfer/fillet edge on an entire object (without having to pick all the edges). Kinda silly it would seem, but a GREAT time saver and really nice when you need to break the edge for rendering to get rid of that "too sharp" look with little fuss.

AW