No matter how cushy or softly sprung your luxury SUV may be, basic physics suggest that a long-wheelbase sedan is a better bet for occupant comfort. The combination of a long wheelbase and low ride height naturally lends itself to a pitch and sway resistance that any SUV will struggle to match.The forthcoming Phantom-sized Rolls-Royce SUV and other inevitable mega-wagons may prove otherwise, but for now a big sedan is generally easiest on your neck muscles. Read the full BMW 7 Series 2016 review .