which is the best Microsoft certification for .Net.

This is something like broad and generic question because Microsoft offers mainly three key paths for .Net technology:

2.       MCSA – Web Application

3.       MCSD – App Builder

Now, if you are working in windows than windows related will be good and same for web or azure developers.

Here, I have shared few links which will very helpful to you to decide which one is best for you

1.       Microsoft Certification Path

https://www.nhireland.ie/Portals/33/Microsoft_Certifications/Microsoft-Certifications-Paths-2019.pdf

2.       Microsoft Certification Exams

https://www.microsoft.com/en-us/learning/exam-list.aspx

3.       Role Base Certifications

https://www.microsoft.com/en-us/learning/browse-all-certifications.aspx

I believe this will help you!