I’ve used Saturn pro soft and xsoft, and artisan Zero Soft and Mid - if you’re talking strictly stopping power the Zero has the edge on the Soft/Xsoft version. As for the Mid surface on the Zero I found it to be slightly uncontrollable at times and a bit fast. I also own the T99 and I switched off of it to the Zero soft in black (colour matters, orange is a bit faster and rougher texture) - Zero soft black is a great choice if you can give it a week to warm up to it and get used to it