I suppose it depends on the line...

I use strong braided line (Whiplash) on a big spinning reel when I am banking for sturgeon. The braid provides less casting resistantance for the strength than mono, in my opinion, and a fish as big as a sturgeon requires strong line.

When strength isn't such an issue, I'd stick with mono, since it seems to spring off the spool better in the lighter test weights. If it is the thin diameter of braid that appeals to you, you might want to look into something like Fireline. Some folks here don't care for it, but I like the stuff.