I'm in a 12 team roto keeper. Keep 4 - can keep players indefinitely. Due to the ability to keep players indefinitely, I think it makes high ranked prospects more valuable than "very good" players - but perhaps this is skewed.

Keeping Ryan Braun and Prince Fielder

Need to keep 2 from: Adrian Gonzalez, Hanley Ramirez, Jose Reyes, Anthony Rizzo, Jurickson Profar.

What say you, Grey et al?

I think I would keep the best players. Prospects are great but if it takes Profar a few years to become a top 25 players, you will have wasted a lot of valuable keeper spots. Plus you should be able to get Profar back in the draft pretty easily with only 4 keepers. Maybe you draft him earlier than you normally would but I wouldn't keep him. I would definately get one or two prospect/young guy because AGone and Hanley aren't great keepers but I don't think Profar is better either.