Captain Toad is the real answer. Graphically its very impressive and at a locked buttery smooth 60 fps with all effects. Graphically its quite a showcase. The other games show limitations and have some technical issues that Captain Toad does not.
Bayo 2 and Mk8? No AA. XCX is 30 fps. FRN? Sub 720p fps at times and no AA. Yohshi and NFS are the closest ones to touch Captain Toad, but in the end, its the total package of great effects, great graphics, nice AA and 60 fps. The other games have some impressive graphics and do the Wii U proud, but Captain Toad is a graphical and technical achievement.