Can't do comparisons, but, I can give you a rundown on the M60.
4 DPI settings of your choice. (Slider to set them) 3x on the DPI selector, 1 for the "Sniper Button".
Middle mouse button is pretty hard to press down.
Yes, you can change what the buttons do. Not very advanced, but I set my Forward/Back buttons to Copy/Paste.
Software is ok. No problems with it yet, but I don't use it much.

4 DPI settings of your choice. (Slider to set them) 3x on the DPI selector, 1 for the "Sniper Button".
Middle mouse button is pretty hard to press down.
Yes, you can change what the buttons do. Not very advanced, but I set my Forward/Back buttons to Copy/Paste.
Software is ok. No problems with it yet, but I don't use it much.