User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-184.79.162.235-20120914004808

The WiiU and 3DS versions should be slightly different and offer different weapons and armor from each other. MH3G in Japan offered Nintendo Zone and SpotPass download quests which unlocked special weapons and armors. Though the western weapons and armors may not be fully the same. While you won't be able to take the WiiU with you to say McDonalds or somewhere else to get these special quests the WiiU will have online that will offer things you can't get on the 3DS. To be able to get everything on one character, this is where you'll have to utilize MHU's data transfer ability. So... In the end to get everything you will most likely need both the 3DS and WiiU version of the game.