The Mercedes-AMG G63 is a luxury SUV that is known for its powerful engine, off-road capability, and luxurious features. The 2013 version of the G63 was also a capable off-roader, but the new version has received several updates to make it even more capable in off-road situations.

In an off-road showdown, the new Mercedes-AMG G63 would likely come out on top due to its updated suspension system, improved traction control, and other off-road features such as a low-range gearbox and three locking differentials. The new version also comes with a more powerful engine that produces 577 horsepower, which is significantly more than the 2013 version's 536 horsepower.

However, it's important to note that the 2013 version of the G63 is still a very capable off-roader and is a great option for those who are looking for a luxurious SUV that can handle off-road situations. Ultimately, the decision between the new and the 2013 version comes down to personal preference and budget.