Snaffle vs Pelham...?

So, I just got done reading a book by Heather Moffett. In it, she encourages the use of the mullen mouth pelham over a snaffle. I bought the book because my horse is frustrating me lately and I wanted some different views on some stuff. Now, everything I have ever heard was that a young horse or a horse that is fresh in training (like my 8 year old) should be ridden in a snaffle or other mild bit until you are ready to refine the horse. She says many horses hate the nutcracker action of the snaffle, and if you have to use a lot of pressure with the snaffle, it is not right. Now, how do you guys feel about this? I have never used a Pelham so I am not about to just go out and buy one. It is very difficult for me to get my horse to relax his jaw and she is going on and on in this book about how some horses hate snaffles, pelhams are wonderful, etc. Has anyone every used another kind of bit (other than a snaffle or french link) to help their horse relax their jaw? I plan on continuing in my current bit, because all of my previous training is drilled in my head, but I am curious about what others think.