Mine hated the french link and lozenge options. She wants nothing but the plain old single-jointed. I got myself all worked up reading about the "nutcracker action" of a single-jointed and convinced myself I should go with the french link, and she ran around with her head in the air like a crazy thing. So back to the single jointed.
But my sense is that almost all horses really like them and they can be very soft and comfortable, particularly if you get one with copper on the mouthpiece.
Most people have no idea about a horses mouth shape. A horse with a low pallet will typically despise a single jointed bit, because they poke the roof of their mouths. That horse will likely do much better in a French link or even mullen mouth.
A horse with a higher pallet and a thick tongue(my arab) will hate a strait mullen mouth or French link, and do fine in a single jointed bit.
A horse with a thick tongue AND a low pallet(my BO's draft cross) will likely prefer a ported solid mouth piece, that gives some tongue room without poking into the roof of his mouth.
I usually try a French link when in doubt. Its my first choice because I like how the bit functions, and a large percentage of horses work well in them. Around here you can get several variations, which is nice. I find some horses like the taste of sweet iron or copper(especially those with dry mouths), while others prefer stainless.
Seem to be nice mild bit, l have used them. One horse I have likes it better than a snaffle, the other goes better in a snaffle, just slight nuances I pick up on, no major dislikes from either horse from either bit. Posted via Mobile Device
I'm a big fan of French links, but some of the horses I've ridden just didn't like them. The Arabian lesson mare that I tune up occaisonally likes a D rink French link, as does the Quarter Pony- but the main mare that I ride despises it. I think it is what BlueSparks said, that she just has a high pallet and big tongue. She actually really seems to like riding in a Jr. Cowhorse when neck reining (she's just a ranch horse though) and a single jointed, thick full cheek when she isn't being neck reined.
My Arabian mare cares less about the number of links than about their thickness. Most of the french link snaffles I've seen are too thick for her to accept them well. OTOH, she did fine with this bit, which is essentially a french link curb. I've tried it with the reins attached to the mouthpiece instead of the shanks, and she accepted it better than the thick french link snaffles. So...it depends on the horse and their mouth and tongue and training and...