I've heard the Cair panels aren't all they're cracked up to be. I do like Wintec though....but have heard good things about both brands. I'm not much help here.
I'm not that keen on the cair panels either, but I've been to fit saddles to horses who won't go well in anything but. So.
Be careful with the Tekna saddles.
Of them, the only one's I've found to fit really well are the jumping ones. I've got a couple of the dressage ones in the shop, and they all seem to have very 'banana' shaped trees, so if your horse has quite a flat/broad back, it's unlikely they're going to fit.
Their 'Quick-form" Gullet uses an infrared booth which heats the gullet, allowing it to be widened or narrowed to your horse's specifications. So yeah, it is fully adjustable.
From saddle fitting experience though, I'd still highly recommend the wintec, with or without cair. They're very comfortable, and the flaps look short because they're broader than the original style, but if you look at the more expensive brands like the Prestige Leonardo, or the Prestige Hippos (just for example), they too have quite broad flaps.
The wintec saddles are also a lot more versatile, they have a good resale because they tend to fit different types of horses. The only type that I've had trouble with fitting them on, is the pure-bred Arab. I've successfully fitted them to warmbloods, arabX, thoroughbreds and young friesans (though with the knowledge that the friesan is going to grow and the saddle likely won't last indefinitely because of how broad they become when older).