I prefer 2checkout over paypal because:

1- Better fraud checking mechanism: you will receive a notification every few hours what orders have failed, and what orders have passed. No need for a fraud check department in your company, or at least you could downsize it.

2- You are able to pay via paypal at 2checkout.com as well: All your funds stay centralized in one place.

3- 2checkout accepts credit cards from more countries than paypal.