Dunaev - Petrosian (1945)

I am analysing young Petrosian's game from his book.

This position looks very complex to me and in-book analysis is not detailed enough.

Shallow stockfish analysis does no good also: deeper it goes, 15 depth lines are totally nonsense, so it seems I need like 30 depth here. 

What to do here? There are many playable moves, and imo actual Petrosian's choice looks pretty adventurous for his extremely stable style.

Who is better and what would you play? Why?