That depends from your style of hunting and the types of trees that are in your area. I would say for me I probably hunt 9 trees that are more suitable for hang ons for every 1 tree I find that will work with a climber. You don't want to get caught in the, well I can sit here with my climber but down there is where the deer are but no trees type of deal.
I do have a climber and love it when I know I have a good tree to hunt with it. I use my lonewolf alpha hang on and sticks 10 times as much though.