My immediate response is the third person, and for many years I all but detested the first person voice. All of my earliest work is written in the third person, and most of my favorite writers use(d) a third person voice. Yet, I do love the works of Edgar Allan Poe and H. P. Lovecraft, both of whom used the first person to profound effect. So, over time I have seen the error of my ways and used the first person voice when writing. I think it really depends on what sort of story you are writing, which voice is appropriate to use. Still I do largely prefer the third person voice, though I believe, whichever you prefer, it is good to have skills at writing both.