Best way to travel from Shenzhen to HKIA

I am currently in SZ, and will be flying back to the UK August 19th from HK airport. I have seen a few options ... And the best and easy option (I think) looks like Sherkou Port directly to HK airport for 270rmb? Is this really as easy as I read it? The other option was Futian Checkpoint and get the HK metro there, which is basically the same price. Please help me. I'm traveling there alone so want the easiest
Hannah :-)