As a general rule, I'd go for Deloitte over E&Y any day - better career development, prestige, exit options etc.The particular areas you're being offered make it even clearer for me. Deloitte Ops, as part of S&OP, is the most exclusive part of Deloitte, and does well in the Ops marketplace. Of course, I'm not all that interested in finance advisory, and find ops work a lot more interesting. If you've got a burning desire to be in finance, that can tip the balance for you.I can, however, believe that E&Y folks may be friendlier. Deloitte is fantastic in many ways, but rarely do I hear "fun workplace" as a description.