Shorts are like saddles, depends on the person.
I’ve had good luck Sugoi shorts (and they’re a lot cheaper than assos). I’ve used their Evolution bibs (the cheaper model) on long stuff, 200, 250 miles without too much bother. In fact, I have a pair of their more expensive RS bibs and prefer the Evolutions (so much I have 3 pairs now).
I reckon the most important thing is that the shorts are relatively tight fitting so the chamois doesn’t move about.