So, I'm in the process of choosing the right bit for my gelding. He's mostly been ridden bitless and has had some nasty bitting experience with his previous owners a year and a half ago, which made him extremely resistant to bits as such. Since then, I've taught him to tolerate the bit and to accept it when we ride on a loose rein with a simple, single-jointed loose ring snaffle, but I am looking towards to starting riding a bit more with the bit this year and was thinking of getting him a double jointed snaffle, as his palate seems to be on the low side.
I am myself very inexperienced with bitted riding and my main goal is to continue riding bittless, but I believe that every horse should be comfortable with a bit and I will have a good trainer helping me with the training, so no worries about that. My boy is very mouthy and with a tendency to lean on my hands, if given the opportunity.
So, regarding the bits, I got a little confused about the double-jointed mouthpieces. What are (if there are any) the differences between this type of the mouthpeice:
And this? -
Which could be considered "softer" (I do realize that the true softness lies in the riders' hands) and more suitable for a mouthy and slightly stubborn horse? Should I be looking more into copper bits to encourage salivation? Also, would a heavier bit be better for a newly bitted horse, or, on the contrary - a lighter one?