The Festool TS 55REQ motor is 10 amps, 120v of 1200 watts at 2,000-5,200 RPMs and weighs 9.92 lbs. costs $585.00
The Festool TS 75 motor is 13 amps, 120v of 1600 watts at 1,350-3,550 RPMs and weighs 13.6 lbs. costs $695.00
The Mafell MT55 motor is 15 amps, 120v of 1400 watts at 3,600-6,250 RPMs and weighs 10.5 lbs. costs $771.00
The latter is what I own, presently, having previously owned both the TS 55REQ and the TS 75. I find that the Mafell MT55cc is perfect for me and my needs, but may not be the best saw for someone else. Budget, application, and the desire to fit everything into the Festool system are considerations. IME, the TS 55REQ is great for cabinetry, the TS 75 is OK for cabinetry - but better for thicker hardwoods, and the Mafell MT55cc is great for both cabinetry and at least 8/4 hardwoods with one pass. (I haven't tried to cut anything thicker, yet. The Mafell has a few more bells and whistles, that you can find out on your own.) In the end, I don't think that you can make a bad choice with either of the three. These are the best that money can buy.