Logitech Trackman Marble
This is an okay trackball, and easily available if you’re looking to get into trackballing. I found it to be fairly comfortable (especially with a wrist rest). The only downsides are:
- No scroll wheel
- No middle mouse button
Apparently, you can configure it (at least in certain nerdy operating systems that shall remain nameless) to scroll and middle click and all of that. But I use Windows, so I dunno!
Kensington Orbit Trackball with Scroll Wheel
This trackball is not very comfortable. Its design feels ‘squished’ and using it for a long period of time cramps my hand a little. The mouse buttons are in an uncomfortable position; they’re spaced very far away from the center of the mouse. But it has a scroll wheel and it’s affordable!!!
Logitech Trackman Wheel
This is a great trackball. I bought one of these back in 2010 and it still works after years of heavy use (with some abuse thrown-in for good measure). It’s the most comfortable pointing device that I’ve ever used, and it comes with a scroll wheel.
But it’s out of production and very expensive.