I think you are confusing the Russian/Soviet technique with the Bulgarian.
I was taught by my Russian coach that you should pop your hips and “ping” the bar, and he made me practice it multiple times with an empty bar until I could send the bar flying up fast just by popping my hips into it. One of the more advanced and serious lifters said that when he was learning his coach made him do this so much that he pissed blood. My upper groin was sore for some time, but I never pissed any blood, thankfully. I was also told that this was a distinctively Soviet technique.
But as to which technique is better, it depends too much on the individual athlete to say categorically one way of the other. I don’t know how widespread either technique is among other countries; i.e. how do the Chinese,Turks, Iranians, etc. snatch. That might provide a clue as to whether one is generally better than the other.
If you ever watch old tapes of Iurik Vardanian, one of the best lifters of the Soviet era, you’ll notice that he does nothing of the sort. In fact, it almost seems that he has no explosion whatever when he snatches. And yet he is one of the sport’s greats.
I wonder what his son’s snatch technique is like…