As has been previously stated, it depends on many factors. Some of the most important are stack size, position, and opponent tendencies. I would recommend doing some reading into ICP or independent chip model. The most chips you have the less they are worth individually, especially when compared to smaller stacks. Use this to your advantage. If you have a monster stack, play aggressive as other people won't want to risk getting knocked out. If you have a small stack, it depends on your immediate goals. If you just want to make a min cash, play very tight. If you don't think you'll be able to fold into the money, look for a good opportunity to shove and hopefully double up.
From my opinion, check how many players have lower stack, and wait, there is more then 70% possibility, that someone will go all in and lose, and you will get cash, or if not, BB will eat them faster then you 20%. and only 10% goes to, all Alliners won there hands, if that happens, then you can try go all to, and again you will be above them. Bubble is playing hand by hand so, you can check all and see what happens, i'm talking about online tour.
The bubble is an opportunity to increase your stack as people get nervous and tighten up...
Personally I just want to survive the bubble then i will open up and try to make advancements after that...
I agree with opening up a LOT more after the bubble, because the next significant jump in prize payout is often many spots away. Being blinded down to survive just a couple more positions isn't really increasing your winnings by much.
The game gets tight, because we're about to enter the awards and nobody wants to stay out of the awards. Everybody think: I got here, so I'm not going to make a mistake.
Ours hand selection is much stricter. No more lotto.
if you have a big stack , it is advisable to press because most of the defensive players are waiting for the bubble to burst, if you have a small stack is better to wait for a premium hand to send the all in and not commit other hands