These specs are most, but not all.
Barrel Saddles have a 5" Tall Cantle
Reining Saddles have 3.5" Tall Cantles and Close Contact Skirts
Equitation Saddles are 3" to 3.5" Cantles
Trail Saddles have 4" Tall Cantles
That being said, some Trails Saddles have Close Contact Skirts and 5" Cantles, they are just a little harder to find
Many people use Barrel Saddles to Trails Ride, the ones with the very small and rounded skirts can give the close contact feel with your Horse too.