Also 4WD cars generally have a super low gear for crawling at low speeds & high torque whereas AWD cars usually don't have a similar gear. Low gear is critical

Also 4WD cars generally have a super low gear for crawling at low speeds & high torque whereas AWD cars usually don't have a similar gear. Low gear is critical on steep grades, particularly descending them so you can go down safely and slowly without riding your brakes and overheating them.