I have only had “soft” Delsey Helium and now Briggs & Riley. Both can be rolled aboard most domestic flights and fit nicely in all but smallest overhead bins. H always checks his bags and they still are doing great after over a decade and 4+ round trips/year.
I have looked at and considered but never purchased any hard-sided since we got some for our honeymoon > 30 years ago. So far my soft-sided rollerbags have adequately protected my fragile things when I hand carry or check the luggage (except when TSA opens and does not put bubble wrap back in — grrr!)
Costco has some nice pieces at great prices. Macy’s and Ross have also had nice prices and selections.
Our kids and we all like the 20-22” rollerboard soft-sided suitcase on 2 wheels, plus a backpack as a carryon.