[Xastir] a choice of formats

[Liz]

I've got a choice of formats for CC licensed maps from Geoscience
Australia.
My advisor is on shift at present so can anyone advise which of the
following freely available formats would be best to download?

 ArcView shape file, May be imported into MapInfo, 1.58MB
 ER Mapper Enhanced Compressed Wavelet (ECW), 3.31MB
 ESRI personal geodatabase, 2.29MB
 Georeferenced PDF map, 4.0MB
 Keyhole Markup Language (KML), 1.43MB
 MapInfo Native Format, MapInfo table file, 1.47MB

thanks guys in advance