Horns are best...cut off the brows, and use the biggest set you care to carry. Lucky said it all...as far as I'm concerned. Timing, and volume (to get the sound to carry) is what is important for us out west. Rattle bags don't cut the mustard.
I have had a lot of luck the last two season with the "pack rack" by knight and hale. Get the magnum...for volume. Also, it's a lot easier to carry than a set of antlers. Not trying to pitch a product...that's not me...it just happens to be the best alternative to real antlers out there, IMO.
We have great luck rattling here. Even when it doesn't seem to work, I can't say that it negatively affect deer at all. Small bucks, even does, seem to be attracted to it.