well this is tough, I think some questions to ask are how are you doing in your league? what type of league is this? 

If you are right in the middle of a pts league then I'd say go with brunson as his minutes are a little better, lamb is only averaging 1 assist per game, but Brunson has 3.5, brunson is averaging a full 1 less defensive stat per game, I'd say both of these guys are identical both at 12 ppg, both at 3 rpg and 1 3 pt  per game and both at 24 min but the change is brunson has 1 less defensive stat which is 4 fpts worse but has 2 assists more assists which is 4 fpts better! When you ask me I'd go with brunson as his minutes are better and we know he will be on the bench averaging 24 fpts but lamb has been starting recently and averaging 24 fpts and that will definitely change when levert and warren return and also a lot of his top stats were when Brogdon  was out which he isn't anymore

In conclusion please give me more info but in a vacuum go with brunson (probably)

Sorry, I didn't see this sooner, but I actually had to drop both due to a 2:1 trade that was processed at the same time.  Thank you for your help.

yup, anytime