Size is one of the most influential factors when deciding which SUV to buy. A three-tiered classification system is used to identify size relative to industry norms.

Compacts are the nimblest and most fuel-efficient SUVs. They're good for city dwellers who contend with thick traffic and sparse parking. They offer the practical benefits of a utility vehicle, without the burden of extra girth. The downside is they won't haul or tow a whole lot.

The midsize class broadens the possibilities considerably — many popular choices are in this category. Expect a modest — but often satisfactory — towing capacity, in addition to increased passenger and cargo room. They represent the best blend of utility, comfort and power.

Full-size SUVs are big and brawny, useful for heavy-duty towing, carrying big, bulky loads or lots of passengers and gear. They're the most cumbersome to drive and get the worst gas mileage.