New, customer unused batteries from DJI comes with a deactivated BMS to stop the parasitic draw a activated BMS will otherwise cause. The cells in these batteries are also charged to nominal voltage (3,7-3,8V= approx 50%) where the chemistry in...
This really looks like the gimbal is hitting the mechanical end point as it seems to happen when you let off the stick & the drone brakes.
So depending on flight mode & wind resistance this could be the reason... compare below drone tilt &...
I think we know a great deal... it's just that DJI have had a great success with their marketing of "Smart" batteries. If there exist any kind of DJI "magic" it will be in the chemistry if anywhere, but then doubt that it's optimized for shelf...
Well... they are both good older models with similar pic/vid quality & flight capabilities within legal distances. Beside this they also have many differences that may make you chose one over the other.
Anything special you want to prioritize?