Usertesting.com is an example of what we like to call self-moderated research, meaning that a user guides himself through a website using a script developed by you, and creates a video for you to see. The difference between ethnio and Usertesting.com is that ethnio is designed for you to be able to live recruit and moderate. We are the recruiting element of remote research. If you want to select specific people for your study using filters, or want to intercept real users live from your website rather than use a panel, ethnio will fit your needs better.
We do have integration with Usertesting.com when using branching logic. You can find this integration feature in the '4) Thanks' step of your ethnio account setup.