VWO is a comprehensive CRO platform, and the only one you need for all your experimentation needs. Right from tracking your key metrics and gathering visitor behavior insights to running UI-based and more sophisticated 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, that too at a high price point. VWO also has exceptional support and is compliant with most of the important internet laws.