They both process data differently that’s for sure - relay is your rawest and simplest decentralized form. Dvms are like Shopify - aggregators of sorts and have centralized access points - clients might find it easier to extract data and modify than to custom build, but might create a centralized bottleneck and other centralized risks if not careful. I don’t know enough about redundant events but sounds more like a design issue than a system issue? Maybe better implementations might help (filtering etc)