I think exchange is a lot more secure than most of these P2P platforms, because when trading via P2P, the most important thing to be considered is safety.
Although P2P platforms offer a lot more higher returns than the exchange P2P, as well as more flexible investment terms and conditions but we also need to acknowledge the fact that P2P platforms carries higher risks than exchange P2P due to it's less strict security and verification measures, plus their fees are also a lot more higher than exchange P2P.
Getting scammed via exchange P2P is somehow difficult, except you're careless and negligent, but if you're careful, then you can't just get scammed, and even when one gets scammed, it could be a lot more easier for the issue to be traced and attempt rectification due to it's strict security and verification measures.