public class Benchmarks
{
    // mutable fields (to hide from jit)
    string s1 = 10000.ToString();
    string s2 = 10001.ToString();

    [Benchmark]
    public bool Compare() => s1 == s2; // ends up calling SpanHelpers.SequenceEqual under the hood
}

public class Benchmarks
{
    public static IEnumerable<object[]> Data()
    {
        yield return new object[] { new int[2], new int[2] };
        yield return new object[] { new int[10], new int[10] };
        yield return new object[] { new int[16], new int[16] };
        yield return new object[] { new int[32], new int[32] };
    }

    [Benchmark]
    [ArgumentsSource(nameof(Data))]
    public bool Compare(int[] a, int[] b) => a.AsSpan().SequenceEqual(b);
}