I always had heard that you wanted to go for the longest shank possible to pick up more cooling in the shank. A colder faucet should lead to less foaming as well as help keep any beer in the line cool.
I've got no experience with jockey boxes though so that's just what i've heard in the past. It seems to make sense, while, at the same time, is likely negligible if youre running the beer through a stainless steel coil submerged in an ice bath or some other means of chilling the beer down to 45 ish degrees at time of serving.
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