Hi Erin,
We have a few different screen recording tools in our Articulate 360 suite, so you'll have a bunch of options to record and produce videos. Here's a quick take on it,
- Peek: short screencasts that don't need to be edited
- Replay: screencasts that you want to be able to edit a little
- Storyline: longer screencasts that you want to be able to add interactivity to
Also, this article titled Record, Edit Videos with Articulate 360 will walk you through how each would vary.
As for comparing with Camtasia, these discussions are a bit older, so they're comparing and working with the two tools prior to Storyline 3 and Articulate 360, but should give you a good sense:
Finally, a great resource titled "A Complete Guide to Creating Videos for E-Learning" may be of interest to you!