Could be helpful: When does an ISTP look like an INTP or INTJ? - The Fine Art of Clarifying Type
Don't let N bias get in your way - like Jix said, both IxTPs can be (usually are) smart, creative, and intuitive. Whether your intuition is ISTP's Ni-style (reducing towards the universal) or INTP's Ne-style (broadening towards the universal) can help point you in the right direction.[ISTPs] get involved in an activity, get caught up in the pure joy of doing, and thus become skilled. Rationals need to feel competent and often want a measure of competence before they even do something. To practice or “do” means failure and that often can strike at the core need.
An INTP described his preferred work style as exploring problems and sub-problems (Ne), while his ISTP colleague described a tactical trouble shooting approach with a focus on getting the task done (Se).
Ss more often start with reality and translate to theory and Ns more often start with theory and translate to reality. Generally to Ns theory feels more like truth, while reality feels more sporadic and chaotic. To Ss it is generally the opposite - reality is truth and theory is created to describe reality.ISTPs frequently engage their Relief Role process (tertiary) of introverted iNtuiting and enjoy looking at whole systems and patterns and getting a sense of what will happen in the future.