Does anyone who knows which way is more efficient between making one long webmethod and making 20 similar webmethods?

Does anyone who knows which way is more  efficient between making one long 
webmethod and making 20 similar webmethods? and both way call another one 
com+ search engine.

if make 20 similar webmethods, those call same one function.

Which way is more  efficient ?

ex:
   [WebMethod]
    [return: XmlElement("MusicList")]
    public ListMusic getMusic(string id, int count)
    {
        ListMusic person = new ListMusic();

        Header header = new Header();

        header.resultCode = "000";
        header.resultMessage = "";
        .....

        Music[] musics = new Music[count];
    }


   [WebMethod]
    [return: XmlElement("MusicList2")]
    public ListPhoto getphoto(string id, int count)
    {
        Listphoto person = new Listphoto();

        Header header = new Header();

        header.resultCode = "000";
        header.resultMessage = "";

        photo[] photos = new photo[count];
        .....
    }
...
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