The best thing is to consider, do you enjoy reading and analysing texts academically? Keep in mind you don't get to necessarily choose the texts you will be reading; you'll definitely do some Shakespeare, and probably some (a lot usually) of late-modern British novelists. If you don't enjoy e.g. the Bronte sisters and similar era novels then, you'll probably get frustrated by A-level English Lit.
Economics it's hard to say whether you'll "enjoy" the subject, but it's undeniably interesting in giving some insight into current political affairs which are often legislated under the guise of economic reasoning. While not required for most Economics courses at uni, you will usually enter into a slightly more advanced Economics module in first year if you've already done A-level Economics - which may allow more options later or enable you to take some options earlier (if anything it will make things mildly easier as you'll be familiar with some of the concepts.
Both options are acceptable by universities equally and neither is preferred for any general course, although most English Literature courses prefer English and some Economics courses may prefe Economics. English will probably offer slightly more options if you still have no idea what you want to do, while Economics won't offer as much choice but gives you a chance to start a new subject and you may realise earlier you want to specialise in this area at uni. However, if you did end up wanting to continue to do Economics (or PPE) at uni, A-level Maths would be highly recommended (History, Maths and Economics being a fairly common combination for applicants to these courses, which also allows you a fair bit of flexibility in other options).