When first meeting this person, they may seem to you to have an interesting mind. You may be drawn to their way of seeing things and their unconventional opinions. However, there is a strong chance that they will turn you off by being too blunt, too brash, or too critical. Although you like to understand ideas, you don't get any pleasure out of tearing things apart—whereas your counterpart tends to feel that they don't truly understand a concept until they've done their best to destroy it.
You are values-driven, whereas your counterpart is logic-driven. Although you both like to analyze, your interest lies more with morality and ethics—how can this work best for people? On the other hand, your counterpart likes to reason things through objectively—does this make sense? Is it the most efficient, the most even-handed option? You may find that although you are drawn into fascinating conversations with this person, those same conversations tend to end in frustration as you simply cannot agree on what's important.
However, you may benefit from perseverance in this relationship. Your sensitive, sympathetic nature may at times overtake you, leading you to make decisions that feel right but are not really the wisest option. This person, whose approach seems so cold at times, can help you to tune into your powers of objective reasoning and ensure that you are not letting emotions rule your life. In particular, they may help you to learn to be a bit less selfless, and to put yourself first when the need arises.
Conversely, you can help them learn that there are some decisions that simply defy logic. People like your friend are notorious for trying to quantify everything; this is the sort of person who might make a spreadsheet to decide who to marry. Your deep, thoughtful, and yet ultimately personal approach can show them that sometimes the best decisions are the ones that come from the heart.