Thunderlord is the best against Omnigal because of the arc damage and its really good against Atheon accompanied by weapons of light. No it's not the entirely best gun but Super Good Advice is best for ORACLES in VOG and TLORD is best for Atheon. Both guns are good in their own ways but if he sells Plan C I won't be too happy. I get those all the time from ROC strikes and Crucible. I've broken down at least a dozen.