Been running both units in different setups, so thought I'd share what I've learned from actual field experience rather than just spec sheets.
The Victron Orion-Tr Smart is undeniably the more refined piece of kit. The integration with Victron's ecosystem via VE.Smart is genuinely useful — I've got mine networked with my MultiPlus and it all communicates seamlessly. The efficiency figures are excellent (98%+) and build quality feels robust. However, you're paying a premium for that ecosystem lock-in. For a motorhome where I wanted standalone operation without a BMS, this felt slightly overkill.
The Renogy DCC50S, by contrast, is refreshingly straightforward. No Bluetooth complications, just solid voltage regulation and thermal management. I've had one pushing 50A from a lithium bank without drama. It's about £200-300 cheaper depending on where you source it, which matters if you're on a tight build budget.
Where it gets interesting: the Victron handles variable input voltage more elegantly, which matters if your alternator output fluctuates. The Renogy's simpler architecture means less to potentially fault-find, though support documentation is thinner on the ground.
My honest take — if you're building a Victron-centric system with colour screens and remote monitoring, the Orion-Tr makes sense. If you want a bombproof charger that just works without software updates and complications, the Renogy delivers better value.
What's your existing setup looking like? That'll probably determine which direction makes more sense.