The difference isn't functional, it's operational. A CDP is a routing platform you configure: it sends your events to many destinations, and each destination is left in a vacuum, counting on its own with no idea what the others counted. OneView is a managed service focused on marketing data. It orchestrates instead of routing: it attributes once, deduplicates, and sends only attributed conversions back to the right platform, so your channels don't double-count and your bidding algorithms don't optimise on conversions they didn't cause. A CDP is powerful and configurable, the right trade-off when you require total customization, but every integration has to be configured and maintained, every vendor update handled, every change to mapping or identity logic made by your team. And marketing still has to reconcile their own reporting against each media partner. The real question isn't whether OneView does everything a CDP does, it doesn't. It's what it costs you in time and complexity to maintain a CDP setup at the quality OneView gives you by default. Product data and marketing data are different enough that customers run CDPs for product and OneView for marketing. In fact, you can feed OneView from your CDP.