I personally have only used rsbots.net and I have never used autofighter.org. With the huge selection of script rsbots.net had I have always been able to find what I need and they are all simple to use. However I have heard good things about autofighter too. From my personal experience I would say go with rsbots.net.
I have AutoFighterPRO and SnapeGrassPRO from RsBots.net. In my opinion, they offer the best bots. I have made easily 50m or so total from the SnapeGrassPRO, and trained many successful accounts with AutoFighterPRO. Also, when they go down, they're back up the same day.