I'm a Milwaukee guy but I do have some DeWalt. My problem with DeWalt's ratchets are that they are simply TOO BIG. Size matters and in this application smaller is better. The 18V is suppose to have 70 ft-lb. My response to that is so what. It's a ratchet use the ratchet to break it loose and my High Speed to spin it out. Big torque means nothing if you can't fit it where you need it to go.
I have 4 Milwaukee cordless ratchets and 2 of the Dewalts, the regular and extended, and the extended is the one I use most. It's almost exclusively all I've used since getting it.
I used to think the longer length would be a limiting factor but with cordless the opposite is true. It's not like a hand ratchet where you have to account for turning the fastener. You just have to be able to see the fastener to get the end of the ratchet to it. Being longer just lets me get way down into tighter places and helps to keep my fingers from out of the pinch zone. Being longer greatly reduces the feel of that cordless ratchet kick when it hits full stop too, which also helps keep from banging knuckles as often as I do with the shorter cordless ratchets.
Plus, I do all my breaking free and final torquing with my cordless ratchets, Milwaukee or Dewalt. They work exactly like a regular ratchet when you are not squeezing the trigger. Who the hell has time to be swapping back and forth tools for a single fastener? They all EASILY handle 100+ ft lbs loosening and tightening all day every day thousands of times.
Example on caliper bolts: "Milwaukee M12 Ratchets. Can You Add Manual Input?"
I can say this though, the Dewalt's ratcheting heads are a lot stronger and more durable than the OG small head Milwaukees. If you do a lot of breaking free and tightening with them be ready to replace the Milwaukee's head eventually. I've had to do both my 1/4" and 3"8" drs once each now. The kits don't cost much and they are easy to swap out. I haven't yet wore out a Milwaukee high torque (yet) but just by feel I don't trust they are anywhere near as stout as the Dewalts.