Merck & Co Inc MRK and Pfizer Inc PFE are duking it out for investor attention with fourth-quarter earnings being reported on Tuesday.Both pharmaceutical heavyweights have very different technical setups, leaving investors to wonder which stock will have the upper hand.Let's break down the charts and what the technical signals are saying about each company as they prepare to report.Merck Stock's Mixed Signals: Bullish Short-Term, But Long-Term Resistance Looms Chart created using Benzinga ProMerck stock has ...