VWO is a comprehensive CRO platform and the only one you need for all your optimization needs. Right from tracking your key metrics and gathering visitor behavior insights to running front-end, back-end, and feature tests, VWO allows you to do it all via a single connected platform. You can also plan and manage your optimization pipeline in VWO. Optimizely only offers testing and personalization vs. the whole suite of experience optimization products that VWO offers. VWO also has an exceptional customer support and complies with the most important internet laws like HIPAA.