I have two WBBBs, both 1.1 dbls, and a Hennessey Exped. My biased recommendation would be the WBBB double layer. I have used a pad between the layers with great success, and for me it is just more comfortable, with a much flatter lay. No regrets at all!
SkyPainter - "... and then the police came."
All these years people said,"He's acting like a kid!
He did not know that he could not fly, and so, he DID!
Live Purposefully; Dare Greatly; Land Gently
"Never knock on Death's door - just ring the bell and run! He hates that!"
My outdoorsy YouTube channel is: "WMICommissioner"