You need both, Flitestar does the planning and Jeppview gives you the detail on the airfields and procedures. Flitestar calls up the Jeppview data from within the app, so whilst you have Jeppview installed you will rarely ever actually run it as Flitestar calls the data that it needs from the Jeppview data base.
I have extracted the Jepp plates both VFR and IFR in .pdf files which are viewed via good reader on my iPad. I prefer the iPad over the SolidFX as it gives more functionality in a single device, reducing the need for extra chargers etc when travelling and reducing my weight footprint. Especially important when doing one way flights like ferry flights where the return baggage has to be considered!! Think the thieving Irish airline here......