The PayPal business account is ideal for online merchants, as well as other business entities. The account gives business owners the options of accepting payments without the excess credit card processing expenses. Along with the payment processing options, the PayPal business account provides its merchants with online invoicing options and virtual terminal processing, which allows you to process your customer payments online, as well as by phone, mail or fax. This accounts also provides options for express payments, allowing your customers to quickly check out with their PayPal account without providing personal information. PayPal research shows that businesses using the Express Checkout option see an average increase in sales of 14 percent.
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The PayPal personal account allows you to make safe, secure online payments, as well as send money and accept payments. This account is ideal for those who shop online and even sell on eBay. The personal PayPal account allows you to link your checking account to your PayPal account for easy money transfers and payment options. There is no charge for the personal PayPal account and the PayPal account is accepted at more than 1,000 online stores.
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both sources :
http://smallbusiness.chron.com/paypal-business-vs-paypal-personal-3514.html