I got the Droid on launch day. I picked it because:
1) Highest performance at the time (And an overclocked Droid is STILL negligibly weaker than a Nexus One)
2) Physical keyboard (This is the biggest factor for me; if you gave me the HTC EVO today and told me that I'd have full 4G coverage wherever I went, I'd still pick my Droid over it because I absolutely need a physical keyboard)
3) Looks. Most people think otherwise, but to me, the industrial look of the Droid is far superior over the cookie-cutter "slim and sleek" Apple-like look everyone's going for nowadays. Give me sharp and edgey over curvy any day.
4) Absolutely beautiful screen; the only better display I could think of to read text is e-paper. The quality of text on the Droid puts my 22" 1680x1050 LCD monitor to shame.
Added bonuses I didn't know when I bought the Droid that would make me pick it over anything out there including the Nexus One and anything else that is slated to arrive:
1) HUGE development community and selection of ROMs, and more importantly, RSD Lite so that we can screw with the device however much we want without worrying at all. Other phones have to worry about bricking and can't return to older, more exploitable Android versions after an OTA update.
2) Rooted Droid rivals a rooted N1 in performance
I could honestly go on and on about how the Droid is the best smartphone out there and will be for some time; the HTC EVO will probably beat the Droid but it doesn't have a hardware keyboard, so it'll probably be the new best choice for most people, but not for me!