I have both, and if I where to do it again, I would buy the stainless pins and tumbler.
Most commercial ultrasonic cleaners lack the power to clean heavy soot and primer pockets.
My process is to pop the primers with depriming die, ultrasonic clean the cases, size the & trim cases and then about an hour in a tumbler to remove any lube or brass trimmings.
Don't believe the adds where they have a tarnished case and it comes out factory new. The only way I think you get this is with the stainless pins.
I like my brass shiny so I don't bother posting that I don't need to go through all this effort. My brass, my time so deal with it.
Ultra Sonic
Pros less dust, cleans most of the soot and tarnish
Cons Have to buy the solution, have to dry the cases, cases are clean but not polished.
Tumbler
Pros Cheaper, cases are highly polished when done
Cons Dusty which can be a problem if you have respiratory issues, case lube will cut down on life of media, will not remove tarnish.