Stupid question on drillings and combo guns--(I have owned/shot none)

When hunting would there be an advantage is having a one barrel scoped combo shotgun over a SXS scoped combo? The difference is lighter weight vs weight/handling of 2 shotty barrels(?a pound), of course--but that weight may be substantial over an afternoon.

Personally I would look at a 16x16 x8x57jrs with 2 3/4 shotty chambers versus a single 16 over 8x57jrs. I guess would have to hunt both to decide.