in terms of reception and coverage, i'd likely be fine with any of them.
my immediate interest is with the iphone, because its the "original" and the others are just trying to catch similar lightning in their bottle. i like its simplicity, i like that its purdy, i like all of the available plugins and apps etc.
the instinct seems "meh". the g1 seems currently "meh", but i think could have a good future with android and google supporting it.
the blackberry storm is the only real competitor i'd be interested in, i think. blackberry is a reliable name, i've used older models before. i like the fake-click action of the touchscreen, and i also like how it can be held sideways so my sausage fingers dont mash the keyboard (as im assuming they would on the iphone's tinier keyboard). i also like that it has at least a 3.2 mp camera. still garbage, but somehow less garbage than the pathetically low american phone 2.0 mp standard.
so, at least based on these initial, education-less reactions, the decision could be narrowed to iphone vs. blackberry
as far as i know, they're roughly the same size and weight.
i currently have at&t, which has the iphone, but i have no love for them and wouldn't be opposed to switching to verizon if the blackberry was worth it. i've heard nightmare scenarios on each of their monthly plans -- i believe iphone plans are like 100/month minimum, not sure about storm.
what else y'got?