Chose Google Mobile-Friendly Test
It is the most simple tool to use, paired with Google Rich Test Results it will give you a heads up if you have the basic blocks for indexing in the SERP. It's free, takes a couple of seconds, and helps you to see if the page is ready or not. The other tools in the system are …
Independently Invited by TrustRadius
A de minimis incentive was given to thank the reviewer for their time. The incentive was not used to bias or drive a particular response, nor was the incentive contingent on a positive endorsement. More Info