Why you prefer Revit MEP to Autocad MEP or vice versa?

Revit MEP is more for MEP Designing than for merely intelligent drafting,were as Autocad MEP is used were there only intelligent drafting is needed,also autocad MEP is less Bidirectional as compare to Revit MEP..I prefer Revit MEP to Autocad MEP as it combines both ie; Design as well as Drafting...