It totally depends on the action. If you have a higher action, the guitar string will not buzz as much. Light strings will always buzz more then m strings if the action is left the same.

Do lighter gauge strings buzz more?

Yes, if you are getting buzz with 10s going to a lighter gauge will likely make it worse. If you have an adjustable bridge, raising the action slightly at the bridge should improve things. Are the open strings buzzing? If not, then the action at the nut is likely not the culprit.

Do lighter guitar strings sound better?

Acoustic Guitar Steel String Gauges

Smaller grand auditorium and parlor guitars will sound better with lighter gauges. Playing Style: Fingerpicking styles are much easier to play with lighter-gauge strings. ... If your playing is a mix of strumming and fingerpicking, a light-medium string set may be a good choice.