No-one can make this choice for you - and 'easy' vs 'difficult' is personal to an individual's own abilities.
Ask to have a look at the material / books / syllabus etc for both subjects - does it cover what you thought it would?
Importantly for Eng Lit, what are the set texts - are they stuff you might enjoy? Be aware also that Eng Lit at A level involves far more than just 'reading' as with GCSE, you have to start getting to grips with critical theory etc.