Here’s a quick tip. If you ever need to find out the correct web template Id of a particular site (or site collection,) then you all need to do is navigate to the “create site” screen and examine the HTML.
For convenience, use Chrome and press F12. Then magnifying glass use to click and locate the correct HTML. Once you have, you will notice that the HTML mark-up also contains the web template Id.
e.g <option value=”STS#0“>Team Site</option>
You can now use that in your Powershell scripts.