I have a Wildwood Heritage Glen which is the sister company to a Salem so i am partial to my brand of course. I must say we are very happy with our Heritage Glen.
I have never been in a Vibe so I can't comment on quality, but I would say they are probably about the same.
Here is my other $.02 worth of experience and it may throw you off....buy your dream trailer first, if there is a different model that is bigger or a floor plan that you like in a larger trailer get it.
Don't buy a trailer that you are compromising on something, because after awhile it's going to bother you and you will be trading in your trailer for one without compromises.
You can refer to my thread "3 Trailers in 2 Years" for more info
If it truly is between those 2 trailers the vibe looks like the better choice to me...More carrying capacity in water/holding tanks and it is a little bit bigger trailer. I am also partial to a fibreglass trailer as we get Hail in my part of the country and the aluminum sided trailers get dented easily. The Fiberglass is a big part of the price difference as well as the Vibe is the bit bigger trailer. Also I believe that you can get an outside kitchen on the vibe model (that was our #1 want in our trailer)
Hope that helps,