I'm with Benny, there should have been an option for "None of the Above"

In terms of that comparison chart.. eh, too bad tables don't look nice in forums like this.

N900 has a similar open-ended OS to the Palm Pre, which is good for development - however the Pre wins here because knowing HTML/CSS/JS is much lower a barrier to developer entry than the many supported schemes within Maemo 5 (WRT, Flash, Qt, C++, etc.);
"" would have most likely have a similar hardware feel to the N97;
"" would lack the platform and mainsteam candy-feeling of the iPhone yet will have the same amount of religious fervor (let's call this one even)

The N900 still is only assumed to be a phone; which technically places it in a different class as these other devices until told otherwise.