INTJ and INTP are both pretty independent but I think independence is more of a driving force behind the INTJ - a singularly defining characteristic. The INTPs that I've known have been more accepting of the reality of how things are. I don't know how to put this delicately but they are far more likely to suck up to others in positions of power in order to get ahead. An INTJ would be much less likely to do this. For good or for bad, the goal of the INTJ is independence. I'm not sure INTP is quite the same.