Currently I'm doing both but that wasn't by choice.
I just bought my first rental in January. I talked to several PMs and asked a lot of questions (put together a list of questions using info from BP), then picked the one that had good answers. The guy I spoke to on the phone was knowledgeable and experienced, the guy that was actually managing my property, not so much. I didn't realize it but half of the things that needed to be done were falling through the cracks. And after 6 months there were multiple things I had to do myself (like cutting the grass) because they just were not getting them done. I'm currently replacing them with a new PM.
The biggest thing I've learned is that I need to act like the PM's supervisor. Follow up repeatedly to make sure they followed up on the tasks/issues and then verify that it was completed in a satisfactory way.
Even though I'm hiring a new PM, I still plan to have a more hands-on role. That way I can know about issues and address those issues before they become problems.
@Alicia Marks Thanks for another great QOTW!