Hmmm, that's a tough one. Since I don't do either subject and am really bad at things like that (can barely draw stick people lol) I can't tell you any more about the kind of thing you do in each, the workload etc. You could talk to some people in your sixth form who do to help you decide. I'd just say to pick the one you enjoy the most, but if you really can't decide, art might be better in terms of the broader range you cover. But then again, if you want to specialise in photography as a career, obviously that would be the better choice. Oh, and I wouldn't worry about them not being respected; English lit and history are both very well respected (and I'm not just saying that because I do them lol) so you'll have at least 2 'good' A-levels.