GamerGoldFish
beep boop gimme da scoop
Towns Folk
My top online games with friends include Mario Kart 7, Animal Crossing: New Leaf, and Pokemon X/Y/ORAS. The only reason Super Smash Bros. for 3DS/Wii U is not on here is because with my terrible internet connection i frequently lag out of online battles when i try to play them. 
Mario Kart 7 was always a great online game for me, because even though I lag (pretty terribly) when I play it online, I still can race. (and win a lot of the races!) AC:NL is great, because you can play with people almost like you play in single player in your town, without much lag. The only bad thing is if you lag out of an online game without saving, you lose everything. (Or at least I do.) Pokemon is pretty much self explanatory why it is a pretty good online game. 
Mario Kart 7 was always a great online game for me, because even though I lag (pretty terribly) when I play it online, I still can race. (and win a lot of the races!) AC:NL is great, because you can play with people almost like you play in single player in your town, without much lag. The only bad thing is if you lag out of an online game without saving, you lose everything. (Or at least I do.) Pokemon is pretty much self explanatory why it is a pretty good online game. 