My opinion: most are horrible, some are tolerable, and few are great! I've been "stuck" with ThinkPads quite often, and I do have to say that I've seldom ever used the eraser/nub/(fill-in) always stuck in the middle of the keyboard. When I do, it's just to wiggle it around a bit to be sure that it's still working. Of course, back in ancient times, the nub was the only mouse-alternative on earlier thinkpads.
Best touchpad? Probably my MacBookPro 13-inch laptop. It just seems to sit perfectly, and when used, it's always right at hand, meaning that I don't have to move my hand to use it when typing. It's close to the edge, so it's ergonomically superb. In fact, I've put off getting a larger MBP because the trackpad is farther "inland" from the edge, and just not as comfortable. Second is probably a Dell Mini 12 that I had for a short time, but gave to a family member when the RAM proved impossible to upgrade.
That being said, I still prefer using an optical mouse, as it's just more precise for me. And, despite being predominantly left-handed, I've switched the mouse to the right side, where it is very comfortable. For much of my career I've done network drawings (visio), and they are infinitely easier with a mouse.
"Not everything that can be counted counts, and not everything that counts can be counted." Albert Einstein