As I stated before, you must look at the kids needs. If your child is very attached to her minhagim than she shouldn’t marry an ashkenaz if she is sefardi. That is a need for her. But to tell your daughter not to marry an ashkenaz because he will be different and it’s just not for you is riduculous. We are all Jews.
Pretty is the eye of the beholder and society shoves down our throat this image what beautiful means. Just because someone looks different from you does not mean they are not pretty. It may be hard to see at first because wee all been brainwashed to think pretty = ___________. But why can’t you give it a try?
Don’t just dismiss anyone that has the right middos and sounds like a PERSON meant for your child. Whatever his/her background, race, color, weighth, or heigth may be-just try it.