Though I use a Remington .3006 for big game, I have a Colt Competition for smaller game like deer or wild pigs. The question is not about what the do-all will give you, but what you are using it for. The AR is a fast line to a the target with lighting speed. But you did not mention the caliber for the Marlin. It really is not about the firearm as it is the deliver energy, distance and speed of the cartridge. Give us a reason for the choice...value, cost, purpose, add-on to collection, game size, distance, and accuracy (i.e., in the hands of the shooter...not the firearm.