Hi Ellen, I wish I could help you. I've been having the same question and posting it some time ago. Although my feeling is that BMI is a better option, when I called them and told them that I'm based in UK, they recommended me to register with PRS. I understand that in spite of PRO being these days an international organisation, it still is better to register with the one who deals with people locally although some people were suggesting otherwise. The reason I'm now registering with PRS is because both, BMI and PRS suggested it. I hope I'm making the right decision but if not, may be someone can put me in the right way and I hope you'll find a good and informative advice.
Nadia


Nadia