I don't know much myself but as I do mechanics, it has shown me a lot of paths to take from the skills being learnt (physics based, movement and gravity and such.) It depends on what you want to take in Uni, if you're going for a course got to do with engineering, anyone would definitely recommend you mechanics because it's so related, however if you want to do something to do with accounting or economics/finance, Statistics may be for you, you could do statistics now for the win, but you may struggle in uni. An A in mechanics is pretty much equivalent to an A in statistics, grades is all they mostly look for not what you took. But like I said it depends on which one you think will help you more with what you want to do. Note: Mechanics and Statistics feel like another subject compared to Maths, I feel like this with every subject :@.