The thing is, based on the descriptions and whatnot, I relate to both. They're only different in one category and that category was pretty close on the test. I've never totally jumped on the personality test train but I feel like I flip-flop between the two depending on my mood.
This test gave me ISTP, The "Craftsman."
On the 16 Personalities website I've gotten both ISTP and INTP, the "Logician." I got INTP more recently, and I think that's what I am. I exhibit lots of traits of both though. Perhaps it's more of a mix.