Is it better to view at a higher resolution than my laptop's native resolution?

I'm wondering if I'm better off just watching at 720p on my Inspiron 15 7537 (the 1366x768 resolution version) or 1080p/greater. I'm assuming downscaling will degrade the quality of the 1080p video but upscaling the 720p to 768 does too. If the difference is negligible and you can't detect the difference, I'd like to spare the CPU power and bandwidth and just view at 720p while doing other things. So, basically, having a 1366x768 display, should I be viewing at 720p or 1080p/greater?