Out of the two, Computing, definitely. I do Computing (wish I didn't, mind) and I guess it could be relatively interesting if you're into programming. I'm not, therefore I'm not a huge fan. Wish I did History or politics.
I do Eng Lit/Lang combined too. It's ok, relatively straight forward, but again I wish I did Eng Lit on it's own. The combined course is a bit contrived I find, lang and lit analysis doesn't always mix well but in certain exams you are forced to do both in order to fulfill the mark scheme.
I'm not going to try and comment in detail on the respectability of the subjects, but I applied for English Lit at Uni this year (on the whole, pretty competitive) and I gained some decent offers (Exeter-AAA, Leeds-AAB, Manchester-AAB), so make of that what you will!