None of them.
All of them.
Depends.
There are advantages and disadvantages to all forms of case cleaning. And we all find what's best for ourselves and our loading style
I have/do use both corn cob vibra tumble (Lyman 1200); and wet tumbling with SS pins (Frankford Arsenal).
Corn cob is quick and easy. Gets the
outside of the cases clean. It's a good system, but not without its drawbacks. It doesn't get the primer pockets or inside of the cases clean. If these things are important to you, then another method may be necessary.
SS pin tumbling gets everything shiny clean; inside n out, including primer pockets. Its scrubbing action is very effective - more so than ultrasonic. But dealing with the pins is a pain in the keester. It's kind of expensive up front, and continues to require a cash outlay for the cleaning solution.
Ultrasonic is also expensive up front, but not so bad. It's easy to work with because you don't have the pins to deal with. But it's not very effective with particularly dirty cases (no scrubbing action), and batch size is limited. (I have little personal experience with ultrasonic, so if I mis-characterized something here, somebody please chime in and keep my honest - thanks.)
What do I do? Well my process is a little different, but it works for me:
I first vibra-tumble in corn cob (got a batch going right now
), then process the brass (resize/decap, flair), then tumble in SS pins. It's more effort than many are willing to do. But like I said, it works for me. I am often asked: "Why not just do it this way?" Or "why not do it that way?" And I have an instant and rational answer for all the questions. I have settled into this process and it works perfectly for me. And btw, my brass looks great out at the range and at competitions
. Not to mention, they are also easy to see; and therefore, recollect.