Sun in 7H. I’ve been in relationships most of my life. I think for me, having my sun in that house, it means that through one on one relationships that is how I will learn the most about myself in this life. Aries Venus in 9H I think has more to do with what I like or how I go about trying to obtain things I like. So to answer your question, 7th house has more to do with relationships, Venus more to do with your personal preferences not just for relationships but sources of pleasure and things that make you happy. Also don’t forget the 5H which has to do with sex, fun, recreation, and children, whereas 7H is long term relationships, one on one relationships, and relations with those in authority.