I do both - just depends on circumstances etc. but more often than not (for street driving) brakes.
Generally, there are two schools of thoughts on the subject:
- brakes are much cheaper to replace than a clutch (especially if you're not good at rev matching)
- use the motor and transmission as much as possible to control vehicle speed and assist w/ the brakes (like a lot of a/t cars do these days w/ hill descent)
if you're good w/ rev matching on a downshift, then it's more just a matter of preference I guess but you're clutch will dump earlier (since you'll be using it almost 2xs as much
)