There is no real answer but some are pretty adamant about what is better. It is a matter of taste and activity.
Pants are lighter.
Bibs are more expensive Pants more easily allow snow into areas most would not like it to go Bibs add more bulk to the chest and stomach area Pants add more bulk in the waist area and are less comfortable with a pack or a harness. We are partial to bibs or mountaineering, back country skiing and climbing. Body movement sometimes put pants into positions that are uncomfortable or hamper movement. One way around this is to have a suspendered pant. An option we have used and liked alot.