Why not just use Google Analytics Experiments? That way you can also gather a st ton of other data to help you see if either A or B is performing better.
Hey, so I am the developer of this service. You can surely use GA Experiments for general purposes. The benefit of using a specialist tool is that there would be much more features. Right now, Accredor is in development. In due course it will have more features like User Targeting, Custom Reports, a WYSWYG editor for creating experiments, revenue tracking, etc. Also, very soon we will provide integration with GA to push the reports onto GA.