I have not used the sonic system, but I prefer the easy transition from tumbler to press that a dry tumbler with corncob media allows.
Tumbler is more practical.
I have a sonic but am disappointed in how well it works and how long it takes. I use a tumbler for most of my pistol brass and stainles media in a wet tumbler for some really dirty brass or rifle brass that I want to get the inside real clean.
But really a tumbler with walnut shell will do 99% of what you need
Ultrasonic cleaners are effective for cleaning, but they have several downsides.
First, on a positive note, they're very fast. So if you need to clean brass quickly, they're great for this, and they do an great job!
My issues are mostly personal. I don't want to tumble my brass and wait for it to dry before I reload. And yeah, you can put them in the oven, but sometimes you get water spots, brass darkening, etc. I'm super picky about appearance of my tumbled loads, which is why I think corncob and car wax works best. Load it, set it and forget it for a few hours.
Also, if you have a lot of brass to tumble, unless you buy a unit for several hundred dollars, you can't clean a bunch of brass at once. Constantly refilling, dealing with water, etc, not really worth it for small amounts of brass. But that's just my opinion.
I know people that swear by their ultrasonic cleaners.
If you do decide to do wet, ovens are a wonderful thing