Do exam boards matter?Watch
OCR is more popular than Edexcel especially for Alevels, so I can imagine that you would get more resources online/ help than if you do Edexcel but I don't imagine one being harder than the other.
Not all exam boards offer all subjects and some boards are much more popular than others for certain subjects (e.g. Edexcel is the most popular board for Maths at both GCSE and A level) but it varies. I believe AQA is the most popular overall, followed by Edexcel, then OCR then Eduqas.