My favorite is probably my 360, I had so many games for it (70+) and I loved coming home from school and playing online with my friends. My Xbox One I love also, but I don't ever play with my friends on it sadly. Then it's my 3DS. I have some games for it, but I mainly just play AC and Smash Bros.
As much as I love my 3DS, I had far more games on my DS lite that I really enjoyed playing. So that would be my favourite console followed by my PS2 for sentimental reasons.
Sad as it is, 3DS because I'm a+ Pok?mon trash when it comes to the main series. Even though these ones suck garbage.. they are the current gen so what can I do.
i'm pretty much trash for visual novels so i really love my ps vita (and the screen resolution is beautiful). but of course i love my ds too. it was my first handheld console as an ~adult~ and i've put countless hours into it. getting a vita and going back to the ds screen can be kind of painful, but it's still a gem.
if i had more money and interest in the games out for the ps4, i could see myself really liking it as well, but i think i'm mostly a handheld console kind of gal.