For Casey, broke trail and dressage horse, I use a loose ring Myler Comfort Snaffle
because it was recommended for her small palate and large tongue. She LOVES that bit, she used to be resistant to opening up her mouth for her regular loose ring but now with the Myler she opens right up.
For Candy, to-be eventer that is green over fences and is currently doing lots of dressage, trails, and jumping up to 2.6, I use loose ring double jointed bit made of aurigan, something along the lines of the Herm Sprenger KK Ultra
but she came with her bit so I am not exactly sure of what brand or model it is. She has a very soft mouth and can brace against the bit, hence the loose ring and double joint(or at least why I keep her in it).