This is *very* tentative because I've not dug a helluva lot into the MRA side of things. I've had occasional looks at A Voice for Men and The Spearhead. As I understand it, both of those websites are for Mens Rights Activists of some stripe - whether it's pointing out garbage behavior or agitating for change.
Or sometimes, just a place for hurt men to vent. (Not certain-sure about that one.)
Please correct me if I'm wrong: I have not seen any MRA site advocating self-improvement. They're all about changing the current system so that it's more fair.
MRA's: changing the system.
A system which I (and I think many MGTOW) consider to be irreversibly broken. I shouldn't speak for the PUAs, though I think many of them consider the system irreversibly broken as well. That's why they shrug their shoulders and take full advantage of it.
Note: I will no longer refer to A Voice for Men as "A Voice for Mangina's". Shit, at least they're trying to do something that they believe in - rather than lay on the couch, look at the ceiling, and go wub wub wub. The fact that I think their chances of success are nil is irrelevant, they're getting out there and trying. I wish you luck in your struggle.