I like a UI that lets you scroll in every direction by clicking and holding the middle mouse wheel/button down. This is a more precise gesture than any trackpad can offer. Plus, with a vertical mouse you won't be killing your rotator cuff.
In web browsers this is referred to as "auto scrolling" and it works automatically on Windows but on Linux I have to install a chrome extension to get that feature in Chrome at least. It works in Firefox.
Not sure if it works on my Mac because I gave up trying to use third-party peripherals on Macs since they never work well.
It's a precise gesture, meaning that it happens when you want it to happen and not any other time.
I certainly cannot say the same for scrolling with a trackpad. If I happen to brush two fingers on the thing, things start scrolling when I don't want them to.
In web browsers this is referred to as "auto scrolling" and it works automatically on Windows but on Linux I have to install a chrome extension to get that feature in Chrome at least. It works in Firefox.
Not sure if it works on my Mac because I gave up trying to use third-party peripherals on Macs since they never work well.