i wish i could help you out, but your question is not for everyone. i have never had a business account and i probably will never have one, so i can't comment on that. why do you not just call or go down to the carrier of your choice and inquire yourself? or even check it out online?
I used to work for corporate Verizon Wireless a few years back. As far as I remember the price plans were about the same. You need a tax ID number to set up your business account and if it's a new business, or one without a lot if established credit you will have to put down a deposit. Depending on how many lines you plan on having, they may refer you to a b2b rep and they sometimes offer various promotions.