Bottom Line: A hand-written thank you note is always good, but one with a hook to a memory is even more powerful and impactful.
How it affects building a long-term relationship with the interviewer: You’re showing you pay attention to the details, that you ask good questions, that you follow-up, that you plan ahead and that you are courteous and gracious.
Remember you’re playing at a higher level.
Your goal is to build a strategic relationship; the job is gravy.
Pay attention to the personal question you ask during the interview, remember the answer, then refer to that answer in the thank you note.