Well, so if I'm understanding right, the only good thing about the 5.7 is it's small so you can pack more in a mag, it has little to none recoil, and it can penetrate a lot of body armor. Like some of the other folks said, a 7.62x25 round is 85gr, and travels at about 1700 fps; the 5.7 is 40gr and traveling 2000 fps.
So, the 5.7 is just a little bit faster than the 7.62 Tok, but it's very light, seems more suited for varmint hunting.
The 7.62 Tok goes slightly slower than the 5.7, but is heavier so it has more momentum, which equals more "knock down power"
The 7.62 Tok recoils a bit more than the 5.7, but it's not uncontrollable, and I'm sure that if, God forbid, you did have to shoot somebody you probably would not even notice recoil at all. Plus with practice you can learn to get faster follow up shots regardless of recoil.
The armor piercing factor- The 5.7 travels fast, and is small, so of common sense you know smaller area, greater force (velocity) = more pressure (penetration).
But if I've read somewhat correct info among the interweb, it says that one of the main reasons the 7.62 Tok was invented by the Russians was to penetrate the very thick winter clothing of German forces in WWII. And if you do the math, it sure will penetrate body armor, probably not quite as much as the 5.7, but pretty darn close.
So, they seem equal, only one is best used on anti-personel, and the other seems more fitted for kevlar toting rabbits!