My last kill was my first with a fixed blade, a Slick Trick. It worked really well.
But I can't help going back to my confidence broadheads, mechanicals. I have shot 13 with Spitfires, and I only lost one of those (I shot it in the butt and it flew too far to find it). I really think that arrow flight and shot placement are huge for such a small target.
Whatever you shoot the best with in your set-up is what you should use. For me, that's a mechanical.
Don't get too crazy. IMO, there is no reason to change anything (even your draw weight) from your deer setup.