I too am one that believes it’s worth the extra few bucks to use only the exact tranny fluid specified in the owner’s manual.
Trannys are too expensive to risk. Tranny fluid performs functions beyond just a lubricant. It’s a hydraulic fluid, a cooling fluid, and a seal preservative. It’s also a major component of the torque converter, which is a fluid-transfer device that uses the fluid to transfer torque and to absorb energy when stopped. If it’s not exactly correct you risk a very expensive problem.