What are the best rV brands for fulltime

Thats like asking what truck people prefer. You are going to get answers based on what people own. Is that what you want?
OK
Cedar Creek for their outstanding customer service, and features and build quality for the dollar.

fulltime living in one place or fulltime living moving around?

Based on a previous post... it's a TT RV.

Living one place with travel only occasionally. Don't know yet if we will get a TT or a 5th wheel

I suggest you peruse the posts that are already here. I just saw one called "Full timing rig, the search continues."

The very most expensive ones. :B

Contact the RV Consumer Group for their criteria as to what is required for an RV made for full-timing.
Note that there is a difference between an RV that people full-time in and an RV MADE for full-timing eg. appliances are better quality along with everything else.

That's an easy question. All of them are IMHO

Foretravel, Newell, Newmar, Country Coach, Entegra, American Coach, Tiffin.

If you're not going to travel I would suggest getting a Park Model and a permanent space in a park. Then if you want to travel a little you could get something very small and economical.