You can find most any floorplan across all the brands. There are only so many ways to fit the needed items into the footprint your looking at.
It may be better to look first at brands and lines to get to your desired end product.
Quality is usually followed closely by price. If you are looking used, then maintenance and care become more important, but when new, warranty and service may be good indicators.
Some brands do offer longer warranties than others, and in some cases within a brand, coverages can vary depending on models or lines, Keystone for instance allows full time usage on some lines without impacting the warranty but will nullify it on others.
In general lines with longer warranties are Grand Design, Jayco, KZ, Winnebago, And then to a lesser extent some Starcraft, Keystone, Heartland, Forest River and others.
Those first four have strong fan bases, especially on the east coast where some other highly regarded lines (AF, ORV, Lance) dont have strong dealer support.
Again, if you are buying used, maintenance is paramount, but in new, quality and support become your key.