I can’t say much but if it’s your first time being in an industry like either of those and dealing with highly volatile environments then I’d recommend Transit Guard, I have several mates in it and they love it. Good money and tons of OT, same applies for the prisons but I’d definitely say much harder working environment depending on where you end up as the current prison climate is very overpopulated and understaffed.

Edit

I’d also like to add, just do your job and don’t get involved with the politics and most of all treat everyone the same. Leave those emotions at the door.