If you are an European that has had sucess in your national series in R2 or R5. You feel that you need to go out to some international series in same class to develop further.

WRC is out of the question due to budget. The FIA geo-regional trophys are out, due to 0 publicity.

Your two options are ERC or BRC.
What are your pros and cons if you where to advise him or her?
Is the advice the same for R2 and R5, or are there differences?.