Hello
Rebuy tournaments are very aggressive, as many players don't bother to rebuy, and here the hesitant player becomes easy bait.
But for me, if the tournament is slow, which is my favourite, it's OK to rebuy in the first hour and a half, especially if you're financially prepared for it as the blind hasn't gone up much yet.
As for the turbo tournaments, it is better not to re-buy after the first half hour from the start of the tournament, because the blind is increased.
I always prefer to pay on satellites, as there is always an add-on period after the end of the rebuy period, and this helps me to continue and try to qualify.