I think in order to decide which brand is better, you have to first ask yourself "how much am I willing to spend"...as that will dictate which of the brands have models in your price-range.
On the other hand, if "money is no option", then you have to ask yourself which of the following priorities you've listed are in fact MORE IMPORTANT...
For example, you've listed your "priorities" as:
1. Drive ability
3. Fuel Mileage
But which one is really important to you?
Is comfort really more important than say fuel mileage? Is Drive-Ability really more important than comfort?
Only you can make that call.
If I was in your shoes, then my call would be in favor of Roadtrek and depending on how much I was wiling to spend, my choices would fall between the Roadtrek SS Agile or the RS Adventurous.
I would choose the Roadtrek because:
A. They warranty their craftsmanship for 4 years. Don't know of any other brand in the industry that even comes close!
B. A few more options in way of configurations (Storage vs seating) then any other brand!
C. Portable Tom-Tom GPS unit
Here are what I consider to be the best videos showcasing each brand and what they offer:
* Winnebago Era:
Lichtsinn.com - New 2012 Winnebago Era 70X Motor Home Class B - Diesel - YouTube
* Roadtrek RS Adventurous:
2011 Roadtrek RS Adventurous Camper Van - YouTube
* Pleasure Way: Pleasure Way Plateau 1 - YouTube
And as for who is #1 when it comes to Roadtrek and/or Pleasure Way, from what I found, Pleasure Way
claims to be #1
Class B Retailer
throughout NORTH AMERICA
...big difference when it comes to how one defines "#1"...