Spending more than half the year on the road and having HH Diamond, IGH Platinum, and Bonvoy Titanium I end up having @ equal stays with all three over all levels. It's more than personal choice, it's what's available. Sometimes it distance or ease of access to the customer. Sometimes only one brand is available. Sometimes none of them are either close or available. In some locations one is head and shoulders over the others and at the next it's the other way around. Overall it depends on where you go as to which brand stands out.
You seem to have done your homework and know what you want so unless you have a solid reason to change why do so?