I believe experience is more important. I am a fairly intelligent person with an IQ above 125. I only have 3 bowseasons under my belt, so not much experience. I have killed 7 deer in that 3 seasons. None were what many would consider a mature deer. The oldest was a 3 1/2 yo doe. My oldest buck to date was 2 1/2. I am smart enough to go out and kill deer. I believe I have not yet killed a mature,(4 1/2+), deer due to my lack of experience. That will change as I gain more experience. I will not gain more intelligence despite the fact that I will gain more knowledge.
Something that has been overlooked up to this point is having enough intelligence to benefit from the experience of others. Something this sight has helped me with tremendously.