When to use Microsoft Extensions Logging and Application Insights Asp NETCore in Azure Functions

I am so confused while enabling logging in azure functions in .NET Core 6 using application insights. I had explored lot of sites but still in dilemma what exactly the difference between the nuget packages and when to use at which situations.

microsoft.extensions.logging.applicationinsights

microsoft.applicationinsights.aspnetcore

I had understand that if we want custom telemetry, we should use microsoft.applicationinsights.aspnetcore

I had created separate azure functions with separate nuget packages and I am able to see logs.

With microsoft.extensions.logging.applicationinsights package and used ILogger in function classes.

I added below piece of code in azure function startup

builder.Services.AddSingleton(new TelemetryConfiguration { ConnectionString = Environment.GetEnvironmentVariable("APPLICATIONINSIGHTS_CONNECTION_STRING")});

with Microsoft.ApplicationInsights.AspNetCore package , I injected Di and used ITelemetryClient in function classes

I added below piece of code in azure function startup

var options = new ApplicationInsightsServiceOptions { ConnectionString = SharedMethods.GetEnvironmentVariable("APPLICATIONINSIGHTS_CONNECTION_STRING") };
            builder.Services.AddApplicationInsightsTelemetry(options);