I'd suggest the games of Morphy. The reason is that Morphy has decent positional play, of course, but his famous games show many fundamental tactical themes that pop up the most often. You also learn the importance of development and following the natural basic principles of positional play.
I wouldn't recommend Capablanca, Rubinstein, or Botvinnik (famous for their nuanced positional play) until you're at least B level.
I've been informed/taught repeatedly to study the annotated games of former World Champions or World Class SuperGM's of the "Old" Era. I.e., the modern era players (the players after Bobby Fischer) with the modern game are rather hard to understand for the low intermediate player.
I have never done this before, i.e., study the game collection of one particular player. And I'm thinking that it's of some reasonable import as to who I should start with. I'm looking for recommendations from the Chess.com community. Other factors to consider for my particular situation are age and ability. I'm an older fellow, mid-50's, and I assess myself to be maybe a class C player with aspirations to be a 2000 player one day.
Also, do I start with a player who's known for attacking? Or for solid positional play? It seems to me to start out with an attacking style champion because if it's not my style, then it would be easier to transition to a positional style. Whereas it seems as if the converse isn't true: That it's more difficult to move from a positional style to an attacking style.
That being said, here's the short list (please suggest others whom I've overlooked):
Capablanca
Alekhine
Rubinstein
Tal
Lasker
Botvinnik
Fischer
Who should be my FIRST SuperGM of the Old Era to study?
P.S. Any suggestions on how long it should take me to go over one game when I study the annotated games? How long does it take you typically?