I'm not sure how much content they added, this is my first game, didn't play the wii version.
At the beginning of the game, you have a choice of which weapon you want to use. One of each weapon is in your chest, so you can start off with whatever you want.
Also, either this or New Leaf...hard choice. I would go with this, seeing as you can easily put in hundreds of hours, but if you get the 3DS version, you can't play online. As for AC, you can play with friends online, expanding game time working on building your town. Eh, idk, your choice.