As someone who applied to school psych PhD programs with LOTS of research experience related to disability (my research interest, broadly defined), even a publication, but no child research experience and very minimal (compared to my fellow interviewees at least) child/child clinical experience. I believe my relative lack of child experience hurt me significantly, though I did end up getting into a couple of excellent, funded PhD programs, so I don't have any huge regrets.
For EdS/MA+CAGs programs, child/clinical child experience is probably even more important. Is there a way for you to do the clinical job and get (perferably child-related) research experience on the side? If so, that would be ideal, I think.You really want both, but in your situation, you probably want more clinical experience.