said 1 year, 1 month ago:
I just walked a client through this process. Here’s the differences in a nutshell.
YouTube picks a random frame as the cover for your video. And it displays other random videos to play when your video ends.
Vimeo Pro lets you choose the frame for your cover image, and you don’t end up advertising for other videos.
My client posted her book trailer both places, but she embeds the video on her website, Facebook, etc. from her Vimeo account. It’s much more professional that way. I believe she paid $60/year.
Both are HD. Both play the video equally well. It’s about the wrap around content that the service providers add (or don’t add).