One of the elements of choosing your jungle route is future proofing. Future proofing is basically the concept of accounting for what might happen in the future in a way that is most likely to maintain a gold, XP, and/or tempo lead (possibly all the above).

Tempo at it simplest is if it takes me 3 moves to get to a gank and it takes the enemy jungler 4 moves to get to the same gank, then I have the tempo advantage. Meaning I get to act first. (which could be good - leads to clean gank that earns you a kill or a summoner spell or it could be bad - puts you into a losing countergank...
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