In the States the most popular saddle trees are wood wrapped in rawhide. Here in Colombia the wooden tree quality is way below the american trees. The rawhide is not sealed well leaving gaps of exposed wood, this results in water penetrating and causing mold. Another problem is termites which will attack the exposed wood.
Here in Colombia I only use plastic trees like the U.S Ralides, they're stronger and not affected by mold, rot or termites. Top photo is the plastic tree practically indestructible . Bottom photos wooden tree lots of gaps where water can get in.
Solo uso los fustes de plastico aca en Colombia. Fustes de madera aca estan hechos en un baja calidad. Se da`nan con el humidad y gorgojos.