Milwaukee if you want to do to 12v route. Their 12v line is extensive and getting larger and better. My friend only keeps the M12 Surge and has never run into a screw/bolt he couldnt get off.
Makita if you are going above 12v. They have the largest line of tools that use the same battery type and if a piece of equipment needs more power they just double up the batteries no special batteries.
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