I’m going to sound like a huge fragrance snob, because I am, but usually, high end fragrance (not to be confused with designer) is so complex and layered and lasts and lasts and that’s why it’s worth the price tag. With designer you usually are paying for the name and celebrity marketing.
I will add, that doesn’t mean cheap fragrance can’t smell nice, because it can (and one of my all time favourites is very cheap) and you should wear what you like, but the notes will be far fewer and the blend will be basic. Usually (not always) it also won’t last as long.
For me, it’s like the difference between decent fine dining and comfort food. I love both and both have their place but it’s clear why the former is very expensive and the latter is not. And this has very little to do with preferences.