I tried all the classes out and while I didn't currently maxed out all of them, I found NIN's to be the most enjoyable. Maybe because I always like playing the archetypal stealthy-rogue type? But I really like how FFXIV designed the NIN's playstyle and for me, it fits like a glove. The fast-paced gameplay, the supporting-abilities you can have, a magical bunny to call on a whim.

SMN came to a really close second because I also immensely enjoy playing jack-of-all-trade classes, Red Mage here I come! (fingers-crossed.)

I haven't really delve into healing all that much, so that may change but I will say I'm surprised how much I enjoy tanking. How does the saying go? "If you want to do something right, do it yourself."