Some people love when the mechanics get the focus of the session. Others prefer mechanics never enter the picture. When I started playing RPGs the DM said that some of the best sessions are the ones where no one ever picks up a die. It's not untrue, some of the best sessions are those, but what type of session would you prefer?
I think a lot of us fall in the middle. We want some mechanics - if only because that means there is stuff going on - but we also want time to further plot, express our character, and forge relationships with NPCs and other PCs. Still, if you had to choose, which would you go for?
Personally, I think I might go for Mechanics Heavy. I'm fine with, and capable of, expressing character despite having a full session combat going on. You can work things in around the mechanics. However, you still have the dice and the unknown to add that extra bit of excitement. A session without mechanics while capableof being fun, could just as easily be story time or something where nothing is ever at risk.
How about you? If you had to choose, which way would you go?