Summit all the way. I had a api climber about 6 years ago and the summit is a MUCH better design (faster to set up and more stable when climbing) and WAY lighter. If u are under 6 foot a viper would b good. If u are fat(like me) or tall go with goliath. Ive used both and love them. Also, dont b an idiot! Wear your harness the whole time!!