standard or exo portlet

Hi my friends, i am a novice in working with portals.
I started by creating simple portlets and am trying now to export such work to Exo.
According to Exo examples, all the portled extends UIPortlet, they use the framlework ressources by a different way then the standard one.
i would like to have your viewpoint. In other word, should we follow the Exo paradigm during developping process or developing standard portlet as usually.
Thanx in advance.