Were I born with a male body I think I would still have some dysphoria but not as bad as it is now.
I probably would have been more of a target for bullying as a child though, so I'm relieved I missed out on some of that.
I'm not sure if I'd be more happy or not all in all.
How about if I suddenly had the opposite body? I think I would probably be extremely happy for a bit, then realize that I'm still nonbinary (whoops) and just have to settle in to living with it. I probably (?) wouldn't have to deal with the same levels of depression though.