Ehh, they're both rather boring imo
Between the two I actually prefer gold farming because I can hop in for an hour and make reasonable progress, whether it's with a WAR party or solo. Silver farming is fighting the same bloated CE for the 1000000000000th time. Both lack any sort of variety, which is my main complaint about OC. It's the worst type of grind designed to somehow keep this content alive for a full year.