This is a personal choice of course. That said, I'm an absolute FAN/addict/etc of the Speedy Pro (I have 6, and none of the others).
I think the size, dimensions, shape, etc are all perfect, and everything Omega has done that changes that makes it 'worse'. Most of the color schemes of the Speedy Pro are fantastic however, and I'd take ANY one of those over one of the 'not-quite-pros'.
For example, I hate the reduced, I think the dimensions are wrong. I hate the 44 mm ones, even with the 861-derived movements. They just don't feel as 'elegant'. I dislike the 57 (or any of the 2 sub-dial ones). Same problems as the other two.
Say what you will about Omegas marketing (or my propensity to fall for it), but there is also a certain historical elegance to the pro.