Difference between Collect using legacy and JSON format

I'm new to sumo and perusing our collector/source configurations. Looking at our config for Windows remote collection, I'm trying to understand the difference between "Collect using a legacy format" and "Collect using JSON format".

I know that there is an obvious difference in what the log and queries will be. Aside from that, is there really a difference? Is there a preference on one over the other? What are your thoughts?