Depends on your taste.
I personally think the Droid X is a better phone.
-It is 4.3" while Inc is 3.7" meaning it would be better for surfing the web/reading ebooks/watching movies.
-Rumor has it that the Droid X has a FULL 720p resolution! That is more pixels per inch than the iPhoney4 and despite a 4.3" screen is more pixels than the human eye can discern. Truly a high definition resolution
-OMAP processors have proven to be faster. A 1GHz OMAP processor is faster than a 1GHz Snapdragon processor and probably has higher overclock potential.
-It has Mini-HDMI out while the Inc has a USB TV Out.
The Incredible is a great phone in its own right (HTC Sense>>>Motoblur, 4.3" screen is not for everybody, Snapdragon is fast in its own right), I just think the rumored specs (processor, resolution, screen, etc) for the DX make it the greatest phone ever built (yet lol. Smartphones evolve crazy).