Why Sql Profiler reports some queries as SQL:BatchCompleted and some as RPC:Completed?

The first query SELECT TOP 1 name FROM SiteMast... is issued using SqlCommand.ExecuteReader.

The third query exec sp_executesql N'SELECT n.Nam... is issued using SqlCommand.ExecuteReaderAsync, which should be the same.

I am pretty certain the async vs blocking is not the factor here - tested on a small sample:

using System;
using System.Data.SqlClient;
using System.Threading.Tasks;

namespace sql
{
    class Program
    {
        static void Main(string[] args)
        {
            Sync();
            Async().GetAwaiter().GetResult();
        }

        private static void Sync()
        {
            using (var c = new SqlConnection("server=localhost;database=test;trusted_connection=true"))
            {
                c.Open();
                using (var cmd = c.CreateCommand())
                {
                    cmd.CommandText = "SELECT Namespace,ClientId FROM Client";
                    using (var reader = cmd.ExecuteReader())
                    {
                        while (reader.Read())
                        {
                            Console.WriteLine($"{reader.GetString(0)}\t{reader.GetInt32(1)}");
                        }
                    }
                }
            }
        }
        private static async Task Async()
        {
            using (var c = new SqlConnection("server=localhost;database=dftest;uid=***;pwd=***"))
            {
                await c.OpenAsync();
                using (var cmd = c.CreateCommand())
                {
                    cmd.CommandText = "SELECT Namespace,ClientId FROM Client";
                    using (var reader = await cmd.ExecuteReaderAsync())
                    {
                        while (await reader.ReadAsync())
                        {
                            Console.WriteLine($"{reader.GetString(0)}\t{reader.GetInt32(1)}");
                        }
                    }
                }
            }
        }
    }
}

This code generates two SQL:BatchCompleted events.

My question - what causes some ADO.NET queries to be reported as SQL:BatchCompleted and some as RPC:Completed?