I have multiples of the Russian TT33 and also the Polish, Romanian and Yugo Variants.
When I chose one on which to focus as a carry pistol (yes, they are nice & flat, easily concealable
), I chose one of the Romys primarily because
its funky added-on-for-US-Import trigger-block-safety worked the best for me. It was more a specific-pistol thing than an Romanian-over-Polish engineering thing. The 3 Russians ('44,'45,'52 IIRC) are, for the most part, safe queens.
My Poles sport a noticeably better fit&finish than my Romys.
I have found that the TT33 form-factor leaves
jussssst enough room on the grip to comfortably accommodate all of my fingers (size large gloves w/long, thin fingers), even with thin leather patrol gloves. With thicker gloves I have to use one of my M57s or leave my pinky curled underneath.
My guess is that for a plain shooter/fun-gun you would probably enjoy the M57 a little bit more because of the longer grip, if nothing else.
As I recall, 2 of my M57s came to me with HORRIBLE triggers. I had to replace the sear springs in both while smoothing/stoning the bearing surfaces. One of those sear springs had been reversed (the other had a hole worn in it
), probably the result of a field-expedient repair by a short-on-parts-but-the-bloody-pistol-doesn't-work unit armorer.
That said, the M57s, especially, seem to be coming in in several different conditions. From reading all the ads for these things over the past few years, many also appear to be newly-assembled from parts. I would not worry about getting worn-out parts. Just check the customer reviews at each site on the pistols.
Good Luck! I am sure that you will enjoy whichever you choose.