I am taking Daniel Negreanu's Master Class and this is what he recommends :
"Daniel advises you to play conservatively early on in a tournament, before the antes kick in, because the early stage of a tournament is more about survival than about getting value. You can’t win the tournament in the early stage, but you can lose all your chips. Daniel explains how doubling up your chip stack is not as valuable early on due to ICM—Independent Chip Model—which affects the value of each chip as the tournament progresses. If, however, your opponents are all playing extremely tight as well, then it makes sense to open up your game as a counterstrategy and steal their chips. Just remember: it’s a marathon, not a sprint.
The hand types that are best with the deeper stacks early on are those with the most postflop potential. Suited connectors and pocket pairs hands such as 33 and 7s 6s are great hands that carry minimal risk for a big reward. A hand like A 9o, by contrast, has more
equity but much less potential. Later on, when your only realistic options preflop are all in or fold, offsuit aces can play great as shoves from late position with shallow stacks, but during the early stage they can get you into some trouble. The speed at which the size of the blinds increases should inform how aggressive you are in the early stages. In a turbo tournament, where the blinds increase quickly, it is more important to focus on value than survival."