Bugelrex made good points about software, so I'm going to hit this from the hardware angle, since the OP obviously meant Droid v N900.

In many ways, Motorola designed a nicer piece of hardware than Nokia. Aside from the internal RAM, the droid is thinner, more solid (more metal) and has some very nice docking options the n900 lacks.

Give Motorola their due. For users living in the USA who are looking for the "best" smartphone, this is a tough decision, especially since the Verizon network is far better than T-Mobile's.