I think you made the right choice with the chestnut. The white one's head tossing would drive me insane. The chestnut's gaits also looked smoother/easier to ride. I honestly thought you looked better on the chestnut than the white one. You are a good rider. It was hard to tell in the videos because you didn't actually jump that much, but in a few of them it didn't look like you gave a full release or were really up off their backs. Maybe it was just my viewpoint from the video, so sorry if I'm wrong. Also on the chestnut a few times you would sit the canter and ride smooth then it almost looked like your butt would "bounce" in the saddle. Try to remember to sit up, back and move your hips with their rythm. Your toes stayed up the whole time-I'm jealous. My toes tend to wanna point down, haha.
Overall you looked really good and rode both horses well. Hope you have fun with your new lease! He is handsome.
~He knows when you're happy
~He knows when you're comfortable
~And he always knows when you have carrots.