I love the Martelli ErgoCutter. Have used it for several years now. It's the only rotary cutter I use unless I have to use a specialty rotary cutter. I have never tried the True Cut, so I can't give a opinion on that one, but, I love the ErgoCutter. Since you have arhritis in your hand, the Ergo Cutter is made for people who have problems with regular rotary cutters. You might want to give it a try.