I worked at a camp that had a herd of over hundred head. We did lots of trail rides and beginner riding class stuff. I worked there almost ten years, my go to horses the ones that when a kid said "i'm scared" where all mares its been over 8 years since I left there and the really good ones that I remember are the mares. Now here in Montana, its a little different. Its all about the Geldings everyone says mares are a waist of time, mares are cheaper gelding are more a lot of the time its only that they are a gelding. And guess what here its the geldings that are better horses.
I have worked with lots of horses, mares and geldings I have worked with RANK geldings that were not worth anything, I have worked with "baby sitter" horses both mare and gelding. I think horses are like people, you have to take them one at a time mare, gelding, paint horses, appies, ponies, "Arabs". A good horse is a good horse.