You can test your landing pages using Microsoft Advertising's dynamic parameters to rotate between landing pages and compare metrics to determine the better performing page.
Using dynamic parameters {param1} and {param2} will allow you to maintain keyword-level tracking while testing separate landing pages.
Note: Param 1 and Param 2 are both limited to 70 characters, so clients with long landing page URLs might not be able to implement this approach.
The difference with redirects is that they are usually longer than the limits for Param 1 and 2. Because of this, we need to break up the final URL into two parts, to be split between the creative's Destination URL and Param 1.