I've owned both.
I liked the action on the RAR and trigger was decent.
The stock on the 783 is much nicer and so are the magazines.
My RAR didn't shoot that great. Typical group with my reloads that shot sub MOA in several other rifles. I am in no way saying it is typical.
View attachment 1059610
To be fair, the first 783 that I received was terrible. I called Remington and they were easy to work with, had a call tag out to me the next day. Something must have been wrong because they inspected it and sent me a whole new rifle. This one shoots sub MOA, as posted earlier.