Browser or desktop?
Start with where your demo happens
Most Screen Studio videos show a web app. If that's your case, a Chrome extension is the lightest option: nothing to install on Windows, no admin rights, and the same tool on every computer you use. Screenix records the tab you're on and follows you to other tabs in the same window.
If you need to show desktop software, an installer or your terminal, choose a desktop app such as FocuSee, Canvid, Recordly or Cap. A tab recorder can't capture those.