Ultrasonic
I've tried it with bulk brass, but it's such a pain in the ass. You use your vinegar solution to clean, then your baking soda solution to neutralize the acid of the vinegar, then rinse. Then you have to dry your brass, then you can reload it.
I'm much to lazy for that kind of work every time I want to reload. I suppose if I were loading Match quality rounds, I'd think differently. But for plinking and 3 gun shooting, my "less than perfect" tumble, size, trim, load method works just fine.
I do use my ultrasonic for cleaning the bolts on the AR's. No scraping, no fuss. Just drop the bolt in with some brownells gun cleaning solution, and let it run for 20 minutes or so. That's a life saver, right there.