Reader here; as someone with a very limited budget who needs to pick and choose who and where and how to support creators, the suggestion of "same benefits everywhere (for the same $$), with a bit extra offered at the place YOU get the most back" makes the most sense and feels the most fair..
It allows people to make the choice to support you either on the platform they already have or where it does you the most good, being assured they aren't missing out elsewhere.