They all have there positives and negatives. We do own a 2018 374bhs Roamer and have had it since May. We are quite happy with ours and have had minor issues. Our dealer is extremely picky and only sells models he'd personally buy. Small town dealer, the owner is the salesman and his wife does all the paperwork. He sells certain open range, KZ and Keystone products. He personally owns a KZ but said his keystone products have much less warranty items.
We my TT was a keystone and I had to perform quite a lot of work to keep it going and the dealer had a 3 page list after the first summer with it. I camp with someone who had to have their entire roof replaced in their KZ Stoneridge as well as stairs and work on the auto level. Another member of our group has a Jayco and multiple slide issues as it kept coming out when driving and his bedroom slide leaked.
At the time we were buying these were my top brands as I thought they were the better ones with 2 year warranties. I ordered my camper thinking I was getting a 2 year warranty but they changed it a month after I ordered.
At the end day shop for the best dealer and hopefully everything works out.