We just recently purchased a new Gulf Stream Endura 6340 and have received excellent service from Gulf Stream and our dealer on warranty repairs. I have noticed that in the last couple of months that there have been several changes with respect to the Gulf Streams support Reps. To date we have had all warranty problems fixed in a timely and responsive manner. With respect to contacting Gulf Stream directly I have done so on 2 occasions and receive timely responses. Hopefully they have or are fixing the problems that they had in the past with QA and service.
With that being said. The decision to go with the Super C was two fold for us.
First we needed a unit that could tow our boat. Most of the class C's did not have the towing capacity on the hitch. With only 350 lbs tongue weight and 5000 lbs towing capacity plus smaller engines/chassis. They met the towing capacity but didn't meet the tongue weight, since our boat-trailer is 400lbs tongue weight and 3900lbs total weight (this is dry weight before fuel and equipment). I also contacted several of the manufactures, dealers and friends the have the C and Super C chassis for recommendations. I was told that the issues were with the extended frame and not the Hitch (this is where the manufacture extends the chassis frame to fit the motor home). I was also told that I would not be happy with the performance while towing, Especially with the Chevy chassis. So we needed to go with a Super C or Class A if we wanted to tow our boat without problems. Since the Endura 6340 has a GVWR of 19,500lbs a GCWR of 26,000lbs and a hitch that is rated at 10,000lbs this would give us 6,500lbs towing capacity.
Second and final decision to go to the Super C over an A was dictated by our family size. We are a family of 4, Me, my wife, a son and a daughter. With my son being 6'2" and only 15 years old we need a sleeping area that would accommodate him. Since class A motor homes are usually geared to primarily sleeping 2 people and usually with only a J couch and/or sofa sleeper for additional sleeping accomodations there was just not enough sleeping areas for us or specifically him.
So with the decision made to go with a Super C. The decision to go with the Gulf Stream Endura was made because of the options, price point and location of our dealer. We had already purchased the boat, and a new pop-up camper (several years ago) from them and had really had great support. The Endura had many items as standard equipment that were optional or not available on other Super C's. The only options that we did not get on our Endura was the Full Paint package and Diesel Package. To me it was not worth the additional $8k for Paint and $16k for diesel. The cost difference between our Endura and the other Super C's was minimum. To us it was getting a Class C MH With many of the options and features of a class A MH.
So I would take the following into consideration: Family size (Sleeping needs), Towing/cargo capability (If you plan on towing anything) and what options you want.