on the B737 I prefer to use speedbrake, for when I am done burning off the extra fuel I can stow the speedbrake again, with the gear, even though it does produce a bit more drag, it is also a lot more tricky to retract, ie you can lower it at 270kts, lots of noise, lots of drag, but to retract it (should that be necesary) you have to slow right down to less than 235kts.