Integrate with Gmail
Can be sent via a link (as you end up on a page)
Both integrate with other apps (but Bomb Bomb integrates more).
Bomb Bomb Can:
Do a video autoresponder
Segment different recipients and send email
You can customize the page that people are taken to watch the video.
Can track if someone has not only opened your email, but you are notified when they click the video
The page has a place where you can not only watch a video, but there is a chat box and a text box if you want to put links that you mention in the video. This might be good for teams.
In the end, Bomb Bomb has more polish. They appear to have more features as if they've had a few years head start (they did). If you have it in the budget and would like a video autoresponder, check them out. If you just want video email and don't care that the first frame of your video is awful (and want to kick the tires on the idea) then check out Loom.
In both cases, I've found video email gets great results.