Every EA out there are going to tell you that they are the best. I went with a GSPC agent after moving from c/wide as the new EA was on rightmove and GSPC. Most companies like C/wide, clyde, SHogg A&H only really use righmove but for the same marketing fee I got on both website and in paper.
But agree the EA you choose should be an experienced agent that do letting as they will survive.