In terms of healing, no difference. Both with staples and with the stitches, my scar is pretty faint.
However, in terms of moving around/feeling, I much preferred the stitches. He used dissolvable ones. MUCH MUCH nicer. Honestly, an amazing difference between the 2 post-op. At 6 weeks with the staples, I could barely walk 1 mile without bad ab pain/issues. This time around, with stitches, I could easily walk a mile by 2 weeks pp.
That said, go with what you want. It might not be your surgeons first choice (glue and stitches takes longer than staples), but he is most likely well trained in them.
Also, I had a similar crisis of confidence when going for my VBAC. Looking back on it, it was a reaction to feeling out of control and fear of going through the first c/s experience, which I hated. I also thought if I didn't 'get my hopes up' if I had another c/s I wouldn't be so bummed. It turned out that I needed another c/s (heart decels between contractions), and I was still really bummed. There were a lot of unresolved issues from my first two births that, I believe, got in the way of having a VBAC. There was also a bad experience during this past birth that contributed a lot too. It's complicated. Just wanted to mention that feeling this way is normal, but that it's very important you talk about this and explore why you feel this way, either here or with people you really trust.