Roy, for flexibility in controlling the light, yes, I think barn doors work better. But it depends on what you are trying to do. I've used my snoot (with and without the honeycomb grid attached) to provide light to a very percise area. Snoots are good for this. For instance, putting a given amount of light on a specific part of a flower. The barn doors would do this but they are bigger and clunkier and take a bit more playing with to get the light right. A snoot on the other hand, focuses down the light and all I had to do was point it to where I wanted and move it in and out to get the beam of light I wanted. I have also used my snoot with aluminum foil over the front and then put a pencil hole in the foil to get an even tighter mroe controlled beam of light.
One thing to watch out for with a barn door and even more so with a snoot, is heat build up. I don't leave my modeling light on the whole time when I'm using a snoot. Just long enough to place the light. And I don't flash rapidly either. The snoot is very confineing and all that heat produced by the modeling light and flash tube can build up really quickly if you don't let it cool.
They both have their places, though I've probably used the barn doors a bit more than the snoot.
Here is a shot where I used the snoot behind the subject ...

This was one where I used barn doors...
Mike