Buy both. They are really two different animals in my mind. I have both and wouldn't bother putting them together in the same tray. Both are sharp and both can be made to give great shaves but the Feather is the nuts... the Parker is a wannabe fulshinger gizmo. The Parker works but has no class. I used to relegate it to touch up but haven't even done that for several months.
As was said, if you decide it all sucks for you, you can sell the Feather for close to what you paid for it. You can probably sell it to me. ;-}
Inventor of the world's first safety vibrating Kamisori with night light. Go to http://badgerandblade.com/vb/showthread.php/299465-A-milder-Kamisori: Inventor of the Weckisori - (thanks sychodelix)