It depends on your weight and riding conditions.
For typical use by adults or youths on f as irly level terrain, any grease will do.
However, if your heavier, or there are long and/or steep grades involved then you'll want a high temp grease.
FWIW when I first started in the b bike industry, I had occasion to talk to an engineer at one of the last companies still making coaster brakes in the USA. One of their design tests involved a 300#+ employee, and a long steep hill nearby. He'd drag the brake all the way down to heat the hub until it glowed.
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