What Is the difference between HTTP(S) and BrowserView/UserView Tasks

In short, UserView and BrowserView Platforms’ tasks load a web page in a real browser and execute all page components, while HTTP(S) Task uses emulated “synthetic” browser and only downloads page element that was requested without rendering. 

For more more details, see Differences between Monitoring via HTTP(S) and via BrowserView/UserView and Differences in Time Measurement Between HTTP(S) and BrowserView/UserView Tasks.