Depends on:
The buy-in amount
Lower entry fees lead to weaker players which means more Level 1 play. Make strong hands, stick all your chips in, grow your stack or get knocked out and start again.
Stack sizes in relation to blinds
Tournament just start? Then you probably shouldn't be 3b jamming all in with your A8. You're going to be way better off playing tight right now. But down to 10bb's jamming that A8 seems like a no-brainer right? Well you just got more aggressive as your range widened based on changes in game conditions.
Stage of tournament
Similar to last, early on I prefer a tight approach. If I win a few hands great, I'm more looking to stay alive. As the bubble approaches I'm looking to open up my game, and try to accumulate chips as players try to survive to know they made the money.
There's tons of other factors that will influence my decision, but it really does just depend