I have pasteurized milk straight from a cow in different ways and it is different than raw milk. I prefer the flavored of the pasteurized, but all of them are much better than regular whole milk from the store. Store milk is just more bland in every way, and not just because it's less fatty.

The flavor of milk changes with what the cow eats, so if cows are on pasture then the flavor will change over the year as the grasses change and if they are on hay for part of the year that obviously changes the flavor as well.

Quite possibly the worst glass of milk I've ever consumed was in Mexican Hat, Utah, where the cows had apparently gotten into an onion patch. This went unmentioned until I asked why the milk tasted so strange.