If it's a choice between just these two specific loads, I will take the Black Cloud every time. I have used both in the past (the exact loads in the video as well) and the Black Cloud is definitely the better quality shotshell. Patterns can be very good out of both the Super-X and the BC, but the BC has better pellets and (since 2018) cleaner powder burn. One major difference not discussed in the video is the wadding. The BC uses a Fed. Flitecontrol wad, whereas the the Win. Super-X uses a basic full length non-tox shotshell cup/wad with 4 pedals.
Personally, I have stopped using steel shot entirely and will not be going back. In 2019 I transitioned to BOSS and now everyone I hunt with has also made the switch. My all around choice for waterfowl in the 12ga is the 2-3/4" 1-1/4oz #4 load, and for a dedicated goose hunt I use the 3" 1-1/2oz #3 load. No need for a 3.5" when all you need fits in a 2-3/4" or 3" hull. My favorite load of all time from Boss has become the 10ga 2-1/16oz load of #2's for CRUSHING fat honkers; It's just brutal on them.