I am not a fan of the first two bits. The snaffle style jointed mouthpiece on a shanked bit is crappy theory of a transition bit. I don't mind one of those with a dog bone in the middle and short ,swept back shanks. I had a Keith Welling bit built like I just described and I got by with well but eventually traded it off.
Also I noted on the first two bits the mouthpiece placement was a little different. On one bit the mouthpeice was placed a little forward of the shanks than the other...that will change the balance, a long with the curvature of the shanks themselves. Also one appears to have a longer/higher purchase than the other intensifying the leverage.
The third bit is great if you have big thick tongued horses that like the tongue relief. Two out of four of my own horses would not like that bit.(again these are my horses)
I have two that love palate pressure and are very happy packing a bit on their tongue. They get rode in a half breed with a roller and a spade with a roller.
And I have two that have very sensitive palates and prefer bar pressure and less on their tongues. They like a low square port with short shanks.(but even then it doesn't have the amount of tongue relief as the bit pictured above) Or with Stilts I can ride in a 5/8 bosal and not have to worry about his mouth..lol
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