Comfort and fit!! I personally prefer the air bags instead of wool flocked but that's just my preference. I feel that the horses move better and I also think it's my comfortable foe me! I hate stiff and crappy quality leather! So always a saddle with great leather! Check out DK saddlery! They're my favourite saddles ever and I have a 11 year old jumping saddle it's still in perfect condition! I've had their dressage saddles and western saddles! The best saddles in my opinion and so comfortable!! Every horse I've put it on I've seen drastic improvements!!
Leather. I don't like plasticy firm leather. I like soft buttery leather, i like a soft seat but still feel a tiny bit of firmness in the saddle. And im silly but I LOVE stitching designs on saddles. It gives the saddle personality