I am in the process of applying to PhD positions in educational sciences in the US and UK. However, I have come across two distinct recommendations regarding what to include in my email when contacting potential supervisors. Some mention that only a CV is enough, while others mentions attaching SoPs (or even proposals in the case of UK universities). I am having a problem deciding which is the best route. How should I proceed?
A related question is that in my field, PhD admissions and funding are usually decided by search committees/admissions panels. So is it better to maybe contact the program director instead of a potential supervisor?