As a kid I lived in Chile and Uruguay, and I rode horses which were rented out to trail riders.
Criollos are great little horses. Thinking back I am utterly amazed how these little tough horses were so forgiving of my totally ignorant attempts to “ride” them. I was strictly a passenger.
Do not let any weaker looking hindquarters fool you. The Chilean Criollos we got to ride handled going up and down the STEEP foothills of the Andes mountains just fine. I did not get to ride really good Criollos, I remember the ones in the trail riding strings often stumbled. This is not totally surprising, none of the ones I saw ridden had riders that showed any knowledge of how to improve on a horse’s musculature.
My favorite breed by far are Arabians, however if a Criollo magically appeared on my land I would consider keeping it. TOUGH little horses.
The best book showing the true soul of Criollos is “A Tale of Two Horses” by A. F. Tschiffely, a Swiss guy who bought 2 Argenting Criollos, Gato and Mancha, and rode them from Argentina, along the Andes Mountains and hitting jungles in the valleys, through Central America up to and through a decent bit of the USA (he did skip Nicaragua, they were having a revolution).
This book was reprinted by the Long Riders Guild. It is well worth reading. Both of them got shipped back to their native Pampas and turned free.
This book is where I learned about Trapalanda, the horse paradise. When I die I hope I find my way there.