modo is a sub d modeler. The 'look' of the finished object has nothing to do with the software - it's entirely in the hands of the modeler. If you look through modo's gallery you'll see what I mean -
modo and Rhino do different things, it's an apples to oranges comparison.
Having said that, working in one platform is always preferable to spreading yourself over several. I know because I often have to move from autocad to sketchup to modo and back again and there are always unexpected consequences. If T-Splines can give you what you want and you can do all your work in one program than that will be a benefit in and of itself, regardless of questions of which program is 'superior' to the other.