Resolution Rendering


So I know it's bad to render a video higher than the video resolution is e.g 1024x768 to 1920x1080 but what resolution should I stick with for this?

1680x1050 to 1280x720 or..

1680x1050 to 1920x1080?

I'm confident with the 1080p one because that's 300pixels less compared to 400 pixels more.

Which option should I go for guys?