Logitech M570 vs Perixx PERIMICE-517

I would suggest using trackball mouse if you have limited right hand space. logitech M570 is really comfortable for example. But the major issue seems to be that keyboard and how it is too wide, you probably should look for narrower keyboard. Maybe you could find tenkeyless ergo board and use separate numpad on the left?

Usually it isn't, but when it is, it's only a limited run. The struggle is real, and this Perixx is an apparent newcomer. This trackball is larger than the tiny size that Logitech has so fervently embraced, but not as large as the "original" models I discussed earlier. Still, it is larger, and I'm not stuck sacrificing a USB port for wireless connectivity that I never needed

Bottom line, however, is that I NEED this shape in a trackball, and nothing else out there comes close to being what I need. I buy several at a time, fearing that these, too, will be discontinued one day and leave me having to learn how to use a different kind of pointing device that won't be as functional for me even after I get used to it. If you like this design, this trackball is the best option out there, imo, and just do your best not to drop it (unless you need exercise: getting up a lot to track down the ball is not what I think they meant when naming it a "trackball," but is a common need for me!).

Not as soft as the M570's. That is also my perception and preference. Many people like to feel the clicks while scrolling. PROS: Very comfortable shape, even for small hands