I just completed my A-levels, I did both history and English.
Just want to get my personal opinion out there: history was an absolute mess.
It was my biggest regret in terms of A-Level choices. I chose history because I had been really invested in GCSE history. Later discovered that this wasn't enough of a basis to have chosen it. Obviously, I think it really depends on the exam board. I did edexcel and the sheer amount of stuff that you have to memorise utterly ridiculous. We had to study the history of 3 countries for our exams. Each country had about 150-200 pages worth of information to learn, and every sentence on each page was just a new fact. So multiply the number of sentences per page by the total number of pages.
Disgusting. Absolutely disgusting. My pile of flashcards ended up being like 10cm high.
History ended up taking up so much of my study time, that I struggled to study for my other two subjects. It just ended up that I quit studying for it altogether closer to the exams.
Then again, I don't think that it's particularly difficult to get a decent grade in. I got consistent D's and C's in my mock exams but came out with a B in the exam. I am not a secret genius. In fact, I'm hella dumb. I studied 2 weeks for my first history exam, 2 days for my second and pulled an all-nighter for my last. In my third exam, I pretty much did not even write two of the essays. Yet, still came out with a B. My friend who was getting D's and U's pulled a C, and I know for a fact that she barely did any revision. So I'm thinking that grade boundaries have probably been lowered...?
English Lit was a LOT better. You don't really need to learn "set" facts. As long as you are creative, know how to make stuff up and can write decent essays, you should be fine. And being able to bulls*** IS important because I did not study for ANY of the poems that they asked for in the exam, luckily I am good at making stuff up and pretending like I'm smart, that I managed to pull the grade that I wanted LOL.
If you are definitely more passionate about English, I'd say do that. I personally think that an English A-Level with help you more when choosing your degree too (unless you want to study history at Uni, an essay based subject or don't even want to go Uni). But it's your call.