3DS has been my most played gaming device for the past 3-4 years. It's really struck all the right chords with me. Tales, Fire Emblem, and Zelda are three of my favorite franchises, so those all hooked me early on. Since then, I've been reintroduced to old games (Animal Crossing, Pokemon) I used to like or completely new series for me (SMT, Monster Hunter). Digital and Retail combined, I have over 50 games on it, which is pretty unusual considering my limited gaming time. It really is a great system with a wide variety of games.
I've been considering a Vita for some RPGs that look interesting, but the more time passes, the less likely it seems I'll be getting one. I already have a hefty backlog of JRPGs on the PS3, and my handheld fix is being satisfied pretty well on the 3DS. I honestly don't really get the itch very often for handheld-specific RPGs, which is likely the main reason I would buy one, so having one or the other suits me just fine.
I also have an iPhone, but my gaming on that is limited to the occasional rhythm game when I'm waiting for something.
NNID: Zephyr25 / PSN: Zephyr--25 / Switch: SW-4450-3680-7334