program.cs

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;

public class Program
{
    public static async Task Main(string[] args)
    {
        var summary = BenchmarkRunner.Run<ArrayVsList>();
    }
}

[MemoryDiagnoser]
public class ArrayVsList
{
    [Params(20, 80, 300, 800)]
    public int capacity;

    [Benchmark]
    public int[] ArraySquidlist()
    {
        var playerArray = new int[capacity];
        for(var i = 0; i < capacity; i++)
        {
            playerArray[i] = i;
        }
        return playerArray;
    }

    [Benchmark]
    public List<int> ListSquidlist()
    {
        List<int> playerList = new List<int>(capacity);
        for (var i = 0; i < capacity; i++)
        {
            playerList.Add(i);
        }
        return playerList;
    }
}