I've got both. I bought the TS75 first because I had some rough 9/4 ash that I needed to sraight-line rip to prepare the stock. I used that saw for everything, but after a couple of years and a trip to end-user class in Lebanon, I bought the TS55. It does cut sheet goods smoother than the TS75, due to more teeth passing through the material at a faster speed. I mainly got it because it is easier to handle for most tasks, but I would never give up the additional capability of the TS75. If I had not had to process that heavy ash in the beginning, I would have bought the TS55 first.