Which test mix model option to select for REST Api Load Testing in Visual Studio?

I have created the WebTest file and now adding new Load Test using the WebTest file. The WebTest file contains api snapshot of my session that performs several REST Apis including Post, Get, etc. The Web Performance test is passing successfully.

I am creating the Load Test using Load Test Wizard in Visual Studio where I am asked to pick up Test Mix Model as shown in screenshot:

There are following test mix model options for your load test scenario:

1. Based on the total number of tests

2. Based on the number of virtual users

3. Based on user pace

4. Based on sequential order

I referred the official documentation but I am not able to understand still which model mix to use and what is the difference and performance impact each mix create?