I haven't yet because I have been checking with the universities that I want to apply to and they are asking for at least physics on top of what I already have. I am thinking of doing further maths to help me through the degree that I want to do as well as an extra A Level to help my application.
There is a lot of resources for EdExcel, but I wouldn't necessarily say it's easier. EdExcel can be picky with definitions and use of keywords in my experience, and I hate questions like that. I also had bad experiences with EdExcel in the past. My preference has always been AQA.
Having said that, EdExcel and AQA are somewhat similar.