Originally Posted by
Ode to a Grasshopper
Depends on whether you prefer resemblance to G1 (UT) or updated-but-different-design (MMC).
Personally I'm going for the MMC version (they're not especially faithful to the originals, but they look amazing), but if you want G1 accuracy with better posability then UT would be the way to go. TBH if the budget stretches far enough then I'll get both sets.
That said, maybe wait on reviews once people actually have them in-hand...right now it's all just a few pics on the internet.