For sheer versatility you can’t beat PC, so that is going to have to be my choice. Having flexibility between KB+M and controller, having access to mods and tweaks and (typically) having a wider array of graphics/performance options to tailor to your preferences makes for an unbeatable package.

That being said (and it pains me to say this given my distaste for Nintendo), I absolutely loved the 3DS. The dual screens were cool, it had good ergonomics for me and a nice weight in your hands and there was something very satisfying in the mechanics of flipping it open or listening to the click as you slam it shut. It’s just a really nice device to use.