Speaking as an ugly women, I think being beautiful is definitely a disadvantage in the longer term.
I've known a couple of really stunning women in my life and I wouldn't have changed places with them.
The first women was lovely, but she was completely unaware of how much she coasted through life because of her looks. For example we were once discussing getting through the train station with a suitcase and I was complaining about all the stairs. She was astonished that nobody helped me to carry my suitcase and she said 'But somebody always comes and helps me'. I thought to myself "no s* sweetheart!"
Nice for her now but I can't help thinking it's going to come as a real shock to her when she is older and her looks fade.
The second women I met when she was in her mid 30s. She was annoyed that she'd not been able to find someone to settle down with. I was surprised too considering how beautiful she was.
Later I realised that no man was ever quiet good enough for her in her mind because, for her at least, men were always in plentiful supply. Deep down she knew she could go out to any bar or pub and meet someone else. When she was dating someone she always had other options, so she was never able to 'settle'.
I've also noticed that sometimes, not always, but sometimes, beautiful women can be shunned by other women because of jealousy. Most women are not that ignorant but I have seen it happen.
I think I much prefer being plain.