There is no comparison and never will be. Two completely different players.
Steimsma will never be strong enough to anchor a defense. Perk anchors the defense and directs traffic on arguably the best team in the NBA.
Steimsma will have a long career as a solid backup center. His skill level will get better but he's not going to get stronger.
I agree that both are different types of players. Two different styles.
I don't agree with the sense that Perk anchors a defense. I don't believe he anchors anything. It's called a team. It's called team defense. Perkins isn't good enough to be the anchor out there. He can be a solid contributor to a team defense, but no anchor.
In regards to Stiemsma, his potential is Greg Kite esque....Solid big man off the bench for 10-20 minutes, block shots, change shots, & rebound. Be that enforcer who uses 4, 5 fouls per game, and hit the 15-18 ft mid range shot when open.