I use a Nikon 2-7x32.

And leave it on 2x. Really helps on close birds.

Used to have a red dot. Flew to Texas on a red-eye to hunt birds at 5am and the next four days. I suspect a TSA inspector turned on the scope to mess with it, but I landed in Amarillo, TX at 2am with a dead 2032 battery, and no replacement. Addmittingly, my fault for not planning that sort of thing... but I was glad my FO sights were still set. The Red Dot never went back on the gun. I don't really rely on anything that is JUST electronic in a sight system.