EOCS - Schweser vs. CFAI

Which one do you find harder and which one do you think is more useful for the exam; Schweser EOCQs or CFAI EOCQs? I find CFAI EOCQs harder than Schweser EOCQs but not sure what does it mean. Should we be more focused on mastering the concepts in CFAI EOCQs or Schweser EOCQs?


Thanks green360. This is exactly what I was looking for.