Hi jk and welcome
When we shopped for our coach, the three final contenders were Dutch Star, Allegro Bus and Horizon/Vectra. I think any one of them would have been a good choice but we liked the Winnebago product due to:
- IFS front end (might have been an option on the Bus)
- floor plan - we did NOT want a dash TV but liked the side TV of the Horizon/Vectra
- all wiring and plumbing was neat and looked like there was a master plan involved instead of it being a haphazard afterthought placed after the interior was designed
- wiring, plumbing, and parts diagrams available on-line
- use of circuit breakers for 12V house systems instead of fuse blocks scattered all over the coach
- the "Once Place" center with all controls nicely clustered
- The EMS - not even available on the Bus if I remember correctly
- woodwork quality very high
- fit and finish generally very good
- central basement door locking system - not available on the Dutch Star as I recall
- only Winnebago is a "true manufacturer" of many of the components (extrusions, tanks, shower stalls, front and end caps, wiring harnesses, etc). The Bus in particular looked like some of the interior was adaptation of marine & other vendor-sourced parts. Their interior doorway grab handle was designed for a boat and is not nearly as functional as the 3'+ long assist handle on our Horizon
- as doc mentioned, our layout is very useable even with the slides retracted
One thing that bothered me about the Tiffin product was business continuity - what happens when Bob Tiffin disappears from the scene? He has always been a valuable resource for appealing or escalating repair problems.
As far as handling, the Bus and Horizon/Vectra are on Freightliner chassis. THe IFS Bus and Horizon/Vectra chassis are probably identical for all practical purposes so handling should be the same. Newmar uses Spartan chassis which also have an excellent reputation. Since I haven't driven a Dutch Star (never got to that point) can't comment.
I can say that our coach with the IFS is extremely well-behaved and we can usually steer it with two or three fingers. The IFS front end really makes a difference when the roads are rough and almost eliminates 'bump-steer' (having the steering wheel jerked when going over a bump.)
It was a tough choice for us. You need to decide what your priorities are and then compare brands/models on a point-by-point basis.
The one thing that I wish we had on the coach was a 150 gallon fuel tank - that would have given us more fueling options up here in Alaska and Canada.