As a general rule of thumb, I do not like to use bits that have a twisted mouthpiece. I feel like if I have to use something that has BITE, then I have not done a good enough job training my horses to be soft. But with that said, there's always exceptions. I don't ride my horses in snaffles all that much, since they are older and more finished, but I will use a snaffle when we have on our English attire.
As another general rule, I don't like using bits that only have a single joint. I feel I do better and my horses do better with a double joint (such as a dogbone center or similar). I feel it functions better inside their mouth and can get more flex from it. So the snaffles that I do use have the double joint.
Red goes good in just about anything, as does Dexter. Lilly I am still learning some of what she likes. She does tend to LEAN on the snaffle quite a bit when I ride her English so (here's an exception!!!) I do use a twisted mouthpiece on her snaffle in the English bridle, for now. It helps just enough that she doesn't lean and we can have a more successful ride. At some point, I'd like to put her back in a smooth bit but this is what's working for right now for us.