K98632 on 25 July 2015
I own and love all three of them. It would be a tough call if I could only pick one of them.
As fun as Wii Party U is, I don't feel like it has the draw that the Mario Party games naturally have.
Mario Party 10 is great, but if you downright hated the changed in Mario Party 9 (not just kind of disliked them but hated them) you shouldn't get it. If you don't own any Mario themed amiibos I would hold off until you did to get the most out of the game.
Nintendoland is so diverse it really has something for everyone and was an easy way to introduce non-Wii U owning friends to the system.
Systems I own: Switch, Wii U, Wii, N64, Retron 5 for my Ness, SNES, Genesis, Gameboy line games, Dreamcast, PS2, New 3DS.
