Hum... do you know, or have you noticed if having ridden in one, that it makes any difference in the ride-ability of the saddle? More tacky as opposed to the "slickness" some smooth leather saddles have?
Softer leathers stretch more, so they do feel 'tackier'. They also tend to have a slightly grainy surface which helps with grip.
We have a pair of Ideal dressage saddles - an Elizabeth (calf covered) and a Jessica (plain flap but with suede seat and pads). The first belongs to my daughter (she had to have the dearest one, lol) and is very comfortable, though I've not ridden in it much. I like the Jessica for its suede which is a big help when your horse bucks down the centre line, convinced the arena boards in front of the judge are a jump :P
I'd have difficulty choosing one over the other. Sorry, that's not much help :)