Choosing the right solicitor.

Hello all. At the start of this month I came off my bike and broke my collar bone. This was due to a 4cm deep crack in the road. I want to proceed with a claim against the council and I’ve spoken to thompsons and CAMS. Both take a 25% cut off any compensation. Has anyone had any experience in this arena? How do I know who is the best firm to take my case?