I think results wise Hingis was a better player, and by a significant margin. However when it came down to them both fufilling their talents and potential Venus is better. I think when her career ends she will have had a better career, however she won't catch Hignis's weeks at numbe one. But remember Venus was the best player in the world from summer 2000 to FO 2002, and Hingis probably wouldn't have those weeks if venus played a full schedule, but that if venus's fault.
To me Venus has more skill, and obviously has more strength, speed, and endurance, and those a important traits. But by no means way Hingis a slouch, she was speedy, but she didn't have to ability to hit the winner to make it easier on herself. But she was like agassi that if she got on top of you she could drive you into the ground, but the problem was she couldn't get on top of the top player, and Venus can easily. Just like Serena and Justine can, and Lindsay in her hay day used to.