In-wall vs On-wall for surround and rear speakers
I'm doing some upgrades to my dedicated home theater and one change is I want to make the surround speakers in-wall since they get in the way a bit walking in the room due to where the walking path is. While I'm at it, I'm debating also making the rear speakers in-wall for consistency. Right now my surrounds are Paradigm Atoms and the surrounds are Paradigm ADP-170. If I go in-wall, I plan on a speaker that has an enclosure, or building a backer box since it is important I don't have a lot of sound leakage.
My question is, are in-wall speakers inherently worse performers for a given price point? If I don't need to, should I keep the ADP-170 for rears and just do in-wall for the surround?
Home Theater: Marantz SR6012, Fronts: Paradigm Titans, Sides: Paradigm Atoms, Surrounds: Paradigm ADP-170, Sub: RBH I-12