It's not strictly necessary to clean brass. It will help make your dies last longer if you do, but they will still go bang without cleaning. That said I've used both vibratory and wet cleaning.
I now use wet cleaning with SS pins, water, dawn soap, and a little citric acid (lemon shine). Wet cleaning allows you to deprime before cleaning so the primer pockets are cleaned. If you deprime before using a vibratory cleaner you have poke out each flash hole with a paper clip to get the debris out. Wet cleaning will clean even badly corroded brass that would normally be discarded. The brass comes out looking bright, shiny, and brand new inside and out and I like shiny brass. I guess it's pride of workmanship, but when I make good reloads I want them to look good.
Wet cleaning also eliminates the dust and noise of a vibratory cleaner and that is the main reason I tried wet cleaner. My wife used to complain about noise even when the cleaner was in the garage. The down side is the brass must be dried after cleaning, but I don't have a problem with that. I keep a lot of cleaned ready to load brass on hand so the extra time required for drying is not a concern.