If I were on the shidduch market (I’m happily married b”h), I would prefer not dating someone sefardic just because it would be a major adjustment both halachically and culturally.
It would be very hard for me to adjust to the davening, kitniyos etc I don’t think I’m clean enough to be a sefardi wife too 🙂
If I were a man, I think it would be less daunting because my minhagim wouldn’t change as significantly.
That being said, I do have quite a few relatives and friends who are happily married and the product of “mixed” marriages. So if I would have met a nice sefardi guy, I wouldn’t have let that stop me.