Neither one is necessary or anything more than a flexing exercise. So on that basis, why not get the one that's bigger, more powerful, and quicker by far? The Hummer's probably even more maneuverable given its 10-degree RWS system. The Hummer charges at 800v/350kw, and even with off-road tires, it goes over 300 miles.
I get that some people want the Mercedes badge, but the Hummer costs half the price, does truck stuff better, does the EV stuff better, and looks more imposing than the Benz. And the Hummer's top comes off.
Best,
Tim