I've never thru-hiked the whole DP in a day, and don't intend to any time soon, but I have hiked on every foot of it on various hikes. Just for laughs though, I can point a couple reasons why you might consider west to east instead. For one, people often complain about St. Annes Peak, the last little bump past West Kill-I think it's kind of demoralizing since you think it's in the bag at that point, and then you still have to climb this little viewless knob.
At least going east, a peak is a peak, you know what to expect. Also, keep in mind, the peaks get progressively smaller from Plateau to Indian Head. And having those great views from the east side of Indian Head are nice at the end of the day, with the sun behind the mountains and shadows falling over the valley.
Lastly, if you're not Devils Path purists, you might use the CCCD Platte Clove Preserve trail instead of the Prediger Rd. access. I think (as do many others) that it's a nicer bit of trail than the first little bit of the east end of the DP.
This could be done regardless which direction you take.
Matt