Hey Nate,
I've been shooting the SBE since 1991 and with a variety of different chokes over the years. I have a 24" barrel for mine as well as a couple of others. Everyone has a favorite brand of choke so you'll have many opinions and recommendations. The truth is most of them work very well and with the right shells, I recommend the 3" Hevi-13 "Bronze" shells with either 2 oz of #6 or #7 shot, they'll all do what you need them to do. Of the 2 you've mentioned, I'd go with the Pure Gold.
Thanks,
Clark