Going to work on cars? Milwaukee. Not going to work on cars? Can save a few bucks with Dewalt, the nailguns and saws are real nice. I say this as someone who has a LOT of Ryobi but they just don’t work as well as the better stuff. If I had either of the two big brands I could probably ditch my corded circular, jig and reciprocating saws. Same with the 4in grinder.
Hand tools just mix and match, they don’t need to be the same brand.