Choosing the BestYouTube Video Size

What size video should you choose for YouTube?
What is the best video format? I'm trying to
figure this out myself.

Currently YouTube recommends 1280x720 as the
video resolution when choosing a 16:9 aspect
ratio:

Optimizing Your Video Uploads

I'm focused on a 16:9 aspect ratio as this
seems to be YouTube's recommended aspect
ratio. This is understandable given that
modern camcorders, modern TVs, and modern
computer monitors have a 16:9 aspect ratio.

The whole world seems to be consolidating
around a 16:9 aspect ratio. Given this
fact, the only other choice to make is what
video resolution you will choose. 1280 X 720
seems to be good enough for now.

Actually, it is a little more complicated
than that. The best resolution is the best
resolution that you can afford. In my case,
however, I have an older and smaller computer
monitor. Therefore, I think I'll go with
YouTube's suggested 1280 X 720 video resolution.

This will make it easy for me to create
videos and view them at full resolution at the
same time. How can I be sure of what I'm
creating if I cannot view the video at full
resolution?

1280 X 720 is the maximum resolution my
monitor will support and it will be sufficient
for most people who view my videos. I think
I'll go with 1280 X 720 video resolution.

Ed Abbott