GPX or KMZ?

Would you prefer a .kmz file or a .gpx file? Up to this point, I have used the KML/KMZ file formats almost exclusively. The Keyhole Markup Language format works well when viewing the roads and features in Google Earth or Google Maps. However, I know that many of you may find it handy to have a .gpx file available. Here's your chance...let me know what you need. Should I offer a gpx file along with my usual kml/kmz? Do you prefer to handle the .gpx file conversion yourself?

-David