You can check zostel and moustache in jaisalmer. And can visit gadisar lake,jaisalmer fort,patwaon ki haveli and Sam sand dunes.Also, kuldhara village is quite near..If you are interested in checking ancient ruins.
Well..to each his own.. But yes..if u ask about my opinion..jaisalmer has an edge over pushkar anyday. But then again..it depends on an individual's areas of interests too.In pushkar..the mala is quite famous..But I don't think it's happening as of now..So it's totally your choice!!