Personal development pros: Focusing and having goals on yourself usually results in a better life.
Personal development cons: Most people don't have the discipline to follow through with their goals and can't make lasting changes to their habits. It's easy to fall into the trap of consuming lots of "hustle and grind" content whilst doing nothing. Most importantly, lots of dudes who go this route don't feel worthy of themselves unless they accomplish x and y, and therefore won't go out and approach. They'll "wait until they've progressed" enough in personal development before doing the things that matter.
Self-acceptance pros: "Naturals" are usually this. People who have a high level of self-acceptance are usually more IDGAF and stoic, and therefore more attractive to women. They're usually also more happy and have less cortisone in their bodies.
Self-acceptance cons: The other side of this coin is a very dark and disgusting one. It's cool to be IDGAF, until you DGAF about your own hygiene, health, social skills, finances, etc.
In my opinion, you have to have a good balance of both. You need to find a way to be cool as ****, while still having a general goal. The "self-acceptance" **** is the female part of you and the "being" and "present-moment" bla bla bla zen etc..., while "personal development" is goal-oriented and stressful.
If you have too much of one, then it's not good. If anyone has followed red pill stuff, then Fresh and Fit is probably a good example of way too much "personal-development" hustle-and-grind mindset and not enough stone-cold coolness. Dude went crazy on air and started talking non-sense and got himself cancelled. On the other hand...while the "self-acceptance" mindset is less popular, there are some really cool dudes that just come off as very natural and don't take things too seriously...and are highly desired by the mass majority of women: Mads Mikkelsen and Henry Cavill are good examples. Yeah...they're celebrities, but they'd probably still be attractive to women even if they weren't.
Edit: I wanted to add that, the reason why self-acceptance is sometimes successful, is because you're able to get yourself into a mindset where you feel like you are worthy and deserving of everything and all women. People go through their "working on themselves" period because they don't feel like they deserve the hot chicks that they desire. And I have this theory that the mindset that you achieve, just short of reaching hubris, is more important in being attractive to women than the material successes that one gains through personal development. So in short, use whichever method can make you have uncontrollable sincere confidence in knowing that every woman wants to f*ck you.