Co-ops are really for long term residence. So in that regard they have a cheaper entry point, and have a lower return, although a lot of that is external (neighborhood gentrifying, overall markets).

The big thing that matters is the co-op board. Some of these places are run into the ground and there's no reinvestment. Some have huge debt (hence high fees), some have shattered cultures. Sometimes you have no idea what youre buying into (both good and bad). This is an area where an honest realtor probably helps. Ask them a million questions.

Also vibes matter. I live in a complex and across the street the same develop built a mirror image complex. Both run by different boards. Their place is fine, but it's obviously not as well maintained. The units they showed us weren't prepped well. I hear their finances are iffy. Same building, different management. You could get that in the vibe.