They aren't really any better made, but they do look more modern. The Tt-33 is all milled steel and forgings, where the 52 is stampings and castings. Also, the Tt-33 is far stronger then the 52, due to the small amount of material left around the roller lock cutouts in the chamber area.
If possible, avoid the norc tok clones, as i've seen several with problems and the polish and russian ones are just as cheap, and much nicer manufacture.
The 52 will feel a bit nicer in the hand, but i find that the tok is much more pleasant to actually shoot. Both display about the same level of accuracy.