By modern I mean you can't get 7.62 Tok chambered in anything but Tokarevs or CZ 52s. Try getting a Sig, Glock, M&P, or 1911 chambered in 7.62 Tok. Sure, the Tokarevs are similar to the 1911, especially in feel, but they don't offer the same options as far as sights, finishes, grips, or any of the other parts you can use to make your gun the way you want it.
I have a hard time believing the penetration point doesn't go to the .357, given it's ability to push much heavier bullets than the 7.62, the difference is the .357 can be loaded with much better bullets if your goal is to have a gun that causes as much tissue damage as possible with a reasonable amount of penetration. If you're talking about through hard barriers like steel or glass, sure the Tok penetrates a little better due to somewhat higher velocity and narrower bullets, but is that actually a useful trait?