I'm assuming you're talking about a Mexican or Grackle noseband?
If so, I definitely prefer the Mexican over the Grackle. Though, in my opinion either of them is loads better than a flash noseband.
While their concept is similar, the Mexican is far more effective than the Grackle.
Both nosebands prevent the horse from setting or twisting their jaw to evade the bit and commands given by the rider.
The Mexican is more ergonomically shaped to distribute pressure evenly across the horse's face. Because nosebands *do* apply pressure. Maybe not as much as certain bits apply pressure to the poll, or in an earlier example, the kineton noseband.
For a noseband to be truly effective, it has to be done up firmly. IE: The top part - whether it's a cavesson or grackle (figure 8) should not have any 'give' to it. The lower part or flash, should be 'loose' enough to fit your index finger under.
No item of tack can *ever* make a horse turn more effectively, or respond to a rider's aid or instruction. That part comes down to correct schooling on the flat. A Grackle or Mexican noseband can help with the process, but really, if you want your horse to be quicker with it's turns, you need to work on your schooling work at home. Lots of upward and downward transitions, figures of eight and serpentines, circles and half circles. The horse should be working off your seat and legs, not your hands.
In the attachments, the picture on the left is of a Mexican Noseband, and the picture on the right is a Grackle Noseband. The Grackle is more similar to a regular flash noseband in terms of how it sits on the horse's face. (sorry I couldn't find a better picture). I prefer the Mexican style because (as has already been mentioned) it avoids that sensitive area of the jaw, and also because it's more effective in preventing the jaw from twisting.
It is not 'cool' to ride without a helmet! period.
Last edited by Shimla101; 12-01-2010 at 12:24 PM.
Reason: more explanation!