Skullwaker on 10 February 2015
Wii U because the experiences are just more comfortable and fleshed out to me. Wind Waker HD > ALBW, SM3DW > SM3DL, DKCTF > DKCR3D, MK8 > MK7, SSBU > SSB3DS and then you have games that aren't even rivaled like Bayonetta 2, Hyrule Warriors, Pikmin 3 and Wonderful 101, and that's not even counting all the great stuff it's getting this year. Plus the Wii U has more features and controller options.
But I still love my 3DS.
