Your question is Choosing Quant Over Banking. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Why are you interested in working at a quantitative trading firm rather than a traditional investment bank? Walk me through what specifically appeals to you about that environment and how your past experiences suggest you'd be effective there.