Portfolio vs. Standard Bid Strategies

A standard bid strategy applies to a single campaign on its own. A portfolio strategy is a shared, goal-driven strategy applied across multiple campaigns at once — useful when several campaigns are working toward the same overall cost or return target and you want the bidding system to balance across all of them together.

If you're managing several similar campaigns and setting the same target on each one individually, a portfolio strategy can let the bidding system optimize across all of them at once instead of each campaign competing for the goal in isolation.

Should my similar campaigns share one bidding strategy instead of separate ones?

Ask datanephew to review your current bid strategies across campaigns. If several are chasing the same target independently, a shared portfolio strategy may give the system more to work with.