I think given your subject choices History would be better. And, it is more respected, if that's what you care about.
Though, you also have to question whether you could cope with the workload and have the aptitude to get the grade you want in it. There seems to be the concerted opinion in this thread from those that do both, that Economics is easier. I'm not sure what would be better for whatever course you want to do at Uni, a higher grade in Economics or lower grade at History. Then again, this mioght be irrelevant, if you're good at them both.
Another factor to consider is also which you find more interesting. Doing subjects your don't like is hell at A-level and an unpleasant upwards battle. Your other subject choices would indicate you'd like History better but there's still a decent chance you could like economics.
I'd advise looking into the course content of both subjects and seeing which you're interested in more.