Guilherme is right. You need to try the trail horse in a number of situations before you decide if he is right for you. I knew that my prospective horse had been a lot of places while he was Eventing. He was always the horse they used to make sure new working students could ride before they put them on the greener horses. He had been out on the trails for his conditioning for Eventing. I rode him in a group and out on the trail alone while I was trying him. I trailered him to a park to see how he was in strange places. While we were out alone, we encountered a woman who was driving her pony down a narrow trail. She asked if my horse would be ok if they scqueezed by and passed. My reply was that I didn’t know, as I was just trying him out for purchase. My horse was worried but stood like a statue as the pony went by. The woman laughed and said “Buy him!” I bought him and am very happy with him.
Somewhere, Mr. Right is waiting for you. Keep looking. Also, be ready to get some help (e.g. a weekly schooling session by a pro) when you buy a new horse, so you can increase your odds of success.