Advantages and disadvantages..
Disadvantage of rebuy: Most cases, a rebuy isn't good financially, when the blinds are up towards the end, so you rebuy, to maybe the average sttack, and the min cash usually isn't as much as the rebuy.
Another factor is timing. If you lose a bunch of chips early, and normally excel towards the end, it can make sense to rebuy, to give you an opportunity to build your stack before the blinds get large.