Azure Function: Difference between IWebJobsStartup and FunctionsStartup

I am using Azure Function(v3), I can register dependencies in startup.cs with both IWebJobsStartup and FunctionsStartup.

But which one we should use?

Registerd dependencies with IWebJobsStartup

[assembly: WebJobsStartup(typeof(Startup))]
namespace Notifications.Receiver
{
    public class Startup : IWebJobsStartup
    {
        public void Configure(IWebJobsBuilder builder)
        {
            builder.Services.AddTransient<IEventValidator, EventValidator>();
            builder.Services.AddTransient<IEventReceiverHandler, EventReceiverHandler>();

            builder.Services.AddTransient<IEventHandler<InvoiceResultDto,InvoiceMessageEvent>, InvoiceMessageEventHandler>();
            builder.Services.AddTransient<IEventHandler<InvoiceResultDto, InvoiceFileEvent>, InvoiceFileEventHandler>();
            builder.Services.AddSingleton<IMessageBusFactory, AzureServiceBusFactory>();

            builder.Services.Configure<KestrelServerOptions>(options =>
            {
                options.AllowSynchronousIO = true;
            });
        }
    }
}

Same dependencies I can also register with FunctionsStartup

[assembly: FunctionsStartup(typeof(Startup))]
namespace Notifications.Receiver
{
    public class Startup : FunctionsStartup
    {
        public override void Configure(IFunctionsHostBuilder builder)
        {
            builder.Services.AddTransient<IEventValidator, EventValidator>();
            builder.Services.AddTransient<IEventReceiverHandler, EventReceiverHandler>();

            builder.Services.AddTransient<IEventHandler<InvoiceResultDto,InvoiceMessageEvent>, InvoiceMessageEventHandler>();
            builder.Services.AddTransient<IEventHandler<InvoiceResultDto, InvoiceFileEvent>, InvoiceFileEventHandler>();
            builder.Services.AddSingleton<IMessageBusFactory, AzureServiceBusFactory>();

            builder.Services.Configure<KestrelServerOptions>(options =>
            {
                options.AllowSynchronousIO = true;
            });
        }
    }
}