I did both at A-level.
I think I'd just repeat what people have already said.
Language is fun but more analytical to word-base level such as different types of morphemes, there's about 100 million different adjectives and nouns and etc. So it's all about applying linguistic elements such as grammar, lexis, pragmatics, morphology, etc to texts that you get in the exam and discuss why what the effects of those elements make on the reader.
You will also get the opportunity to study History of the English Language such as how the Germanic tribes developed our language, how many translations of the Bible also helped Language. You also learn about Grammarians (yes I too, didn't think there was such a thing), and the influence of electronic language from social media and the history of the dictionary.
Another topic you'll learn is Children's Language Acquisition. Most student learn children's spoken language such as the development of their spoken language from the effects of babies cooing and babbling to the effects of adult-turn-taking with them. Others study children's written language acquisition which deals with the development of written language such as handwriting and hand-motor skills. How literature and stories help children's writing and spelling and things like the problem with dyslexia and handwriting too. If you're lucky you'll study both and then you can pick which one you want to focus on for exam. Some exam boards make students study both spoken and written development.
NEA part is good. You get to pick any topic in the English Language to focus on if you do A2 of course. I did mine on how swearing is presented through male and female genders. Was so interesting. Used Celeb Big Brother as my evidence.
If this sounds of interest to you, then I suggest you go for it.
Lit is more harder in terms of you'll have to study a lot more pre-19th century texts, including Shakespeare. But this is done separately to that rule. The rule means you have to study anything as early as Medieval poetry like Chaucer all the way up to Jane Austen. So a huge gap in between which is intriguing and very intimidating to a lot of students.
You have to study a 19th Century prose which is good. The basic themes are women, Gothic, Crime/Detection, Society and Post-Colonization/The Foreigner. Which is great. This has a lot to do with context so if you like the 19th century that was all to do with the the collapse of the British Empire, the rise of feminism, hedonism and the corrupt individual, sexuality and sexual liberation, scientific discovery vs faith and religion. Things you may already know when studied this at GCSE.
Also the NEA is good. Usually there's a core text the whole class has to do then you pick another to compare it with. You will either do two parts or one. Two is where you have to focus on one text and the other will be a comparative essay. The latter is just on most Specs. When I did coursework, I did corruption of the individual and its consequences!
So if these things sound of interest, yeah, these subjects are for you. But definitely ask your teachers what they study and even ask if you could sit in on one of their lessons as AS students will be back from study leave and be partaking in their A2 studies now.
They're both great subjects. I loved AS Language, but hated A2. And vice versa for Literature aha!