Plain Html provides form controls via the tag. These are standard controls like textBoxes, dropdowns, and radiobuttons. ASP.Net provides its own version of these controls. Ultimately the ASP.Net version gets rendered as a html. For development you can use either the WebControls or the normal html controls run as server controls. The table below offers some comparisons:
|Description||The ASP.Net controls residing in System.Web.UI.WebControls||Normal html controls that are run at the server. These reside in System.Web.UI.HtmlControls. Setting a HtmLControl to be runat=server does not automatically make it an ASP.Net webControl.|
The Pros and Cons mean that they each have scenarios where one is better than the other. For cases like textBox and dropdown where both can provide the same control: HtmlControls are good for high performance apps because you use only the functionality that you need, WebControls are good for rapid development because it automatically gives you more stuff (which then must be paid for with performance).