I have two Nikon RAII spotting scopes. My first was a 20x60 straight view and my second a 15-45x60 angle view.
Both are bright and clear. The 20x is good out to 100 yards and the straight tube fine for sitting at a table. I find the angle view better when standing or for position shooting. The 15 to 45 power is a better way to go if you shoot over 100 yards.
I haven't used anything Redfield in years and really don't remember much about them other than they used to be the top dog 40+ years ago, but like everything else technology has improved.