As long as it's not starving or being intentionally stressed the tiger probably wouldn't attack as long as you're standing, facing it, and keeping as much distance as you can. They're ambush predators and even maneating tigers generally go after sitting targets from behind. The fact that it's trapped in there with you is probably the most dangerous factor, because it may just freak out and attack you preemptively from stress.

Overall the gator's probably the safest bet, because it's even less likely to freak out and attack from stress than the tiger. So as long as it's not starving and you don't go fuck with it you should be fine.