Choose a compact pickup instead of a full-size pickup when the compact meets the required passenger, cargo, and towing needs and its smaller actual dimensions improve everyday use. Parking, loading access, and ownership costs can favor a particular compact when the extra space or configuration choices of a full-size truck would rarely solve a real problem.
The decision starts with enough capability, not simply less vehicle. Check the exact build, normal occupants, installed accessories, and important occasional loads. A full-size alternative deserves consideration when its usable space or approved configuration meets a requirement the compact cannot. Neither category has a single universal bed length, payload, or cost.