I have them both. As far as the tree lounge goes I got mine ten yrs or more ago so I don't know if they have changed them that much but the 1 I have is HEAVY. It is comfortable, safe and nice to shoot out of. I have the bow platform so I used it for both gun & bow. It does take a little more time to set up but climbing is not a problem. I never had it slip on me. The viper is much more of a portable stand. It is light, comfortable but not as comfortable as the tree lounge. It sets up easy and never had a problem with the cables. Easy to climb and grips the tree nice. I shoot both gun & bow out of it and use it now instead of the tree lounge because of the weight. In fact I have been consideriung selling the tree lounge on ebay.