将const存储在结构体或静态类中

如果我有一组字符串常量，我想存储类似于enum，是最好使用struct或static class ?例如:

public struct Roman
{
    public const string One = "I";
    public const string Five = "V";
    public const string Ten = "X";
}
public static class Roman
{
    public const string One = "I";
    public const string Five = "V";
    public const string Ten = "X";
}