I am not an expert, and I haven't stayed at a Holiday Express in months. But, for what it's worth having used both of these, this is my impression.
The PBC id not a smoker - the WSM is. They are different cookers used for different purposes. I have never used a UDS - but again, my thoughts are the PBC is different. Muebe (on this forum) calls the PBC a "power cooker." I think that is the best description. Used as directed it makes some of the best chicken and other proteins (as well as pizza) you can imagine. However, IMHO, it is not a smoker. And, that's ok with me - I have a smoker.
I enjoy using my PBC and my friends and family enjoy the food.