Um like GMC trucks are not in heated competition with Chevrolet... Oldsmobile lost the battle. I assure you there is fierce competition within the ranks of a group of related companies. The better your sales the bigger piece of the pie that you get.
The battery is not gong to force the drill to use more current than it requests. If you feel safer with the same brand batteries go with that as you set your own limit of risk. Keep in mind however that battery rebuilders often use much higher amp hour rating cells when they rebuild your pack. If you burn your drill up regardless of which battery you use it is because you pushed the drill beyond its limits and not because you made available more power.