A U.S. buyer guide built around size, engines, off-road capability, towing, family use, fuel economy, and the 626-hp Defender OCTA The modern Land Rover Defender SUV is unusual because it does not fit neatly into a single luxury-SUV category. A two-door Defender 90 can function like a premium trail toy. A Defender 110 can serve as a daily family SUV with serious off-road ability. A Defender 130 can carry up to eight people, while the…