I see Richard locked the original turntable vs trackball thread. While I respect the decision I don’t think the topic needs to end there, perhaps a new angle is needed.
I’m particularly intrigued by what Michael W said: “Trackball allows easier access to some viewpoints FACT. How often you need those views is up to you, but it suits sculpting and texture painting more than “standard” modelling.”
If I may, I wish to challenge Michael, or someone who agrees with his assertion, to post two screenshots of the same view, one on trackball, another on turntable, to support the claim. I don’t agree with the claim, but I’m open to being convinced.
Once that is done, and the superiority of the trackball is demonstrated in certain circumstances, then we can take this forward, I have some ideas.