Which is the "best" film to use for LF?

For my own work, I want to make poster-sized prints. This can be done with eith er film type, although it is more expensive to use transparency film for this.

With transparency film, there is no need to make a proof print so there is a cos t savings there. Unfortunatly, there is less exposure latitude so bracketing is desireable and the cost savings is negated.

What do you folks out there in Large Format Land shoot with and Why? What is th e end purpose of your images?