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In most cases, a lower gear ratio will improve acceleration. It will always reduce top speed at a given rpm if no transmission gear changes or tire size changes have been made.
The best gear ratio for a particular application depends alot on the rest of the drivetrain, the engines powerband, and the size of the tires. Lower gears make it easier to turn taller tires, that's why most people with a four wheel drive eventually regear after putting on bigger tires. When you change the tire size, you are effectively changing the gear ratio. Going up a couple of inches in tire size will make a 3.73 ratio act more like a 3.27(for example).....so at that point you would regear to a 4.11:1 ratio to make it perform like it did with the 3.73s and the smaller tires.
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