Bits

["Donnie and Sherie" <taylor@networksplus.net>]

My 3 1/2 year old 1/2 arab filly is currently at the trainers for 30 days training.  He uses a D ring sweet iron/copper inlaid snaffle.  I have always used a mechanical sidepull on my other horses so am totally confused after browsing the catalogs looking for a bit to buy.  Should I just assume that the bit she is being trained in will work the best?

 

Can anyone explain the advantages/disadvantages and difference of action of the following bits:

 

Type of rings:  O-ring, D-ring, loose ring, egg butt, or full cheek

Type of mouthpiece:  jointed snaffle, Dr. Bristol snaffle, rollers, twisted, smooth, heavyweight, lightweight

Material of mouthpiece:  copper, sweet iron, stainless