The classic weight or bulk question is closed cell foam pads v. down under quilt. Both 3 season combinations might weight the same. But the ccf pads are also used for pack frame and sit pad. The under quilt is more comfortable and packs smaller. There actually should be a third variable - multi use. Oh, and the ccf pads can be used to go to the ground.

Match your tool to the job. I can not tell you whether a hammer or a saw is better until you tell me what the job is.

Does that make sense?