Me too. I never really went beyond case 1 with my 5D3 but I never used it for tracking. Used my 7D and 7D2 for that. Now I use them with my 5D4. My two favourties are 2 and 6 and about the same ratio you use.
I used Case 2 for a while, then started to wonder why. Maybe because 1 was default, so 2 means you are doing something more important. Anyway, after a while went back to 1 and never really noticed a difference. I'm not saying there wasn't a difference, just that I didn't notice.