Hi Bean:
It also has to depend on your budget. Really high end like Newell & Prevost can set you back in the 7 figure category very easily.
In my opinion I would look at Newmar, Tiffin & Entegra in the 40 ft + class. None of these coaches are cheap to say the least. You can buy new or buy used.
Many new buyers buy used RV's maybe three to fives years old, they figure let the person who bought it new take the depreciation hit. They also figure that the previous buyer got the bugs out. But that's not always the case. Did they do the scheduled maintenance? Did they take the coach back for scheduled recalls? Or did they run the heck out of it and sell it.
You are new to this so have a used coach inspected by a professional before you buy. One last tidbit. For myself I am a technology guy. I like the latest and greatest improvements on the late model coaches. Things like, In dash navigation, digital display dashes, solar panels, heated floors, WIFI ranger, Instant Hot water no water tank, powered shades, Touch screen control display panels, on board TPMS systems and so much more. Many of these new advancements are NOT available on a coach that is even three years old.
If you buy new, YOU will have to get the bugs out and there will be enough to go around. Maybe try to buy a coach from a dealer that has a reputable Service Department that is in striking distance of your home. This will make your life a whole lot easier.
HH