Gearheads of War

With Papi Blez's latest post, an interview with his brother has led to some discussion over weapons and their current balancing.

With the grenade issue fixed, I think most agree that the weapons are now well balanced, each with it's advantages and disadvantages.

Now onto the point of this diary post, here is the question(s) I pose:

What is your favorite weapon to use and why?

Is your favorite weapon to use also your most effective?