I've often heard that commonly Capablanca and Morphy have their games studied a lot. Personally, I find that I like to study a particular player for a while and then switch later on. It teaches me how they think, play, and adds some variety. What is funny is noticing how my play varies when I've been studying different players. For instance, I was paying a lot of attention to the endgame when I studied Capablanca's endgame masterpieces; however, I found myself sacrificing pieces way more often when I had been looking at games from Tal. xD
I'd pick any strong player you feel like, and then switch to another after a while. Eventually, you may find yourself learning from many of the best players and featuring all of their highlighting elements in your own games!
I was browsing for some annotated game collection from players i like the style (for me: Karpov and Capablanca). But then i remembered a chess.com article which explained that, in the modern era, Wesley So (!) was one player to look for (didn't remember the exact reasons why).
Thus was wondering, who in your mind would be the most universal player to study from?
A player that has good opening logic and knowledge, clear and creative middlegame and great endgame technique. Maybe Kasparov?
I checked quickly and Spassky comes into most of my researches. what would be your pick?