I'm looking at getting a Rupes polisher. I'm not sure if I should go with the 15mm or 21mm. Let's say both have 5" bp what would you go with. Feed back please To me it looks like most are going with the rupes 21mm with a 5"BP.......let me know what your opinions are. Right now I'm the average DD detailer but looking to make this a full time business. Thanks for any and all feedback. :work: