I am an old school dry tumbler, but I have been investigating my next system too. It wii be wet.
Based on what I have read, the SS tumbling is better than the sonic cleaners. Larger capacity, less maintainance, no special solution. I have also heard that the SS media does a more thorough job than sonic, but I have no hands-on experience. I'll bet you get some hands on advice, and I'll be tagging alongside...
I had a ultra sonic cleaner and that was a joke! I'm now using a tumblers tumbler with stainless steel media and I'll never change from that. It's amazing! No more cleaning primer pockets in a separate process because it will get that too. If someone wants more info or help and tips then send me a PM and we can talk.
I have a ultra sonic cleaner and it is terrible. I bought it for one reason, clean the primer pockets and it doesn't even come close. I think I have used it 5 times total. I bought 2 more dry tumblers and I am very happy. Do not waste your money on the sonic system, spend your money on a tumbler and stainless media. That is the only way to get the whole case clean, pockets and all...at least that is what I've heard.