The "best" is what you find the easiet to use and handle. Softimage|xsi and Maya are widely considered the "best". So is Lightwave, Rhino, Shade, 3DSMax, Cinema4D, and five or six others -- it will depend, in a great part, on what they are used to and comfortbale with. All of them, ultimately, will let you do the same things. Wings, in fact, does exactly the same thing they do -- but it doesn't have the extra tools that make it faster, and it works in poure box modelling (like maya, although Nendo and mirai -- who used to be the best -- were it's inspirations). There is no figure present today that could not have ben made in wings. OR lightwave. Or Cinema 4D. Or Rhino. That little silly diatribe over, since you've played with box modelling, try a different route -- perhaps Shade or Rhino, since they use a different primary method (bezier curves and Nurbs) for creating the basic forms and then shift.

thou and I, my friend, can, in the most flunkey world, make, each of us, one non-flunkey, one hero, if we like: that will be two heroes to begin with. (Carlyle)