Walt Mossberg says
that it's much better with phone calls than AT&T but the data speeds are shorter.

Josh Topolsky at Engadget
pretty much says the same thing, offering some charts for data flow that indicates Verizon is a lot slower. But Topolsky also says that it's probably not something you would notice in your day to day puttering around town. He also says that the battery life is a lot better.

Both Topolsky and Mossberg flag the unlimited data plan as a plus for Verizon.

Here are a ton more but the theme is pretty much the same:

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