I dont know which is best. But Ive had a Thumblers Tumbler B with slower speed motor for quite a while. It has to be 20 years now. Started using it with ceramic media for my BPCR rounds. Have used it with dry corn cob media quite a bit also. And now I use stainless steel pins. I probably dont use it as much as some shooters because I probably dont shoot as much as them. But all this time Ive only replaced the belt a couple times. And Ive removed the liner and coated it with a rust preventative. Its been pretty durable IMO.