ESL is effectively a watered down English course which gets marked up. It follows pretty much the same course outline, albeit with slightly different texts. If you hate English, your going to hate ESL as well (Although this begs the question: if you qualify for ESL, why would you even consider English, which marks down, to ESL which is 'easier' and marks up?).
Circling nouns and verbs would actually be closer to English Language than English. English is more of a general cultural study rather than studying the mechanics of English. Even EL only covers the fundamentals of English partially, with most of the course devoted to the applications of language.
To OP: Judging by your subject choices, I'd hazard a guess your the more science/mathematical type? If this is true then I'd recommend English Language all the way. Both Literature and English/ESL are going to have significant focus on textual interpretation and essay writing which most people who favour sciences/mathematics despise. While English Language does require essays, they are much less prevalent in the course (only one in the exam) and, as someone else mentioned, they are much closer to a scientific thesis (e.g., you usually argue your contention through supporting evidence which you have researched yourself) than the English/Literature essays. There are also no 'interpretation' style questions.
The other parts of the EL exam are short answer questions and a much more akin to those you'd find in a science type exam. These are essentially just testing your memory and logic - another advantage to science minded students.