It depends on the subject you want to study at university as to whether they accept the specific access course you are doing. Therefore, if you're doing access to get into a specific course or into a certain uni, it's worth checking with them which ones they prefer before committing yourself to the access route.
This becomes painfully obvious (painfully being the right word) when it comes to subjects like medicine. Not all med schools take access, and those who do only consider a very small, predefined list of access course providers.