Location Class which should be struct?

Location.cs

using System;
using System.Data.Spatial;

public class Location
{
    public Location(double lat, double lng)
    {
        Latitude = lat;
        Longitude = lng;
    }

    public Location(string wellKnownText)
    {
        if (wellKnownText == null)
        {
            throw new ArgumentNullException("wellKnownText");
        }

        DbGeography dbGeography = DbGeography.FromText(wellKnownText);
        if (dbGeography.Latitude == null || dbGeography.Longitude == null)
        {
            throw new ArgumentException("wellKnownText (WKT) is not in a correct format.", "wellKnownText"); 
        }

        Latitude = dbGeography.Latitude.Value;
        Longitude = dbGeography.Longitude.Value;            
    }
       
    public double Latitude { get; private set; }
    public double Longitude { get; private set; }
}

SLocation.cs

using System;
using System.Data.Spatial;

public struct SLocation
{
    private readonly double _lat;
    private readonly double _lng;

    public SLocation(double lat, double lng)
    {
        _lat = lat;
        _lng = lng;
    }

    public SLocation(string wellKnownText)
    {
        if (wellKnownText == null)
        {
            throw new ArgumentNullException("wellKnownText");
        }

        DbGeography dbGeography = DbGeography.FromText(wellKnownText);
        if (dbGeography.Latitude == null || dbGeography.Longitude == null)
        {
            throw new ArgumentException("wellKnownText (WKT) is not in a correct format.", "wellKnownText");
        }

        _lat = dbGeography.Latitude.Value;
        _lng = dbGeography.Longitude.Value;
    }

    public double Latitude { get { return _lat; } }
    public double Longitude { get { return _lng; } }
}