@coachpeter I don’t think you are going to get much more info out of folks. This is a bit like asking: "Republicans or Democrats? Which is better? " People will try to be honest but in the end they will be smitten with the choices they made.
Why don’t you view some of the videos developed by the creators of each? That should give you a feel about whether the product is good for you or not. There is no side-by-side and I’m pretty sure none of us has the time either to create a perfectly unbiased list for you.
This 11 minute video created by the developer of RapidWeaver (Dan) might let you see if Foundry is a good fit for you:
It was only released yesterday.