Drains vs. no drains with a Tummy Tuck, what are the differences?

Some doctors insert drains after a TT for 1-2 weeks and another consultation told me he doesn't use drains but rather uses a different suturing procedure that doesn't require drains. I would rather not have drains but wonder where does all that extra fluid go that would normally drain out of the drain? Will I be more swollen without a drain? Is this a newer technique or a gimmick?