I personally prefer other brands than Dewalt like Milwaukee and Porter Cable. And I never use battery. Strictly corded.
I'm relatively new to the construction trades, and so my opinions may change as I gain more experience with various brands of tools.
At this point, I am very strongly of the opinion that in most cases, DeWalt and Milwaukee are the best brands for professional-grade power tools. I consider them to be about equal.
I was leaning toward Milwaukee, primarily because the tool I felt most needed, when I could afford it, was a reciprocating saw, and Milwaukee had the
Hackzall which was a one-handed version of the concept, that I thought would be better for my needs than a full-sized version. It's very common, in my trade, to need to hold material with one hand, and the saw that you're using to cut it in the other, and I found a full-sized reciprocating saw to be awkward to use one-handed. But I won a DeWalt drill in a drawing at a company picnic, so that put me in the DeWalt 20V system. A foreman shortly thereafter gifted me with a DeWalt reciprocating saw in that same system. So, DeWalt it is.
I've since become sufficiently skilled at using my saw one-handed, when I must. And pretty much by accident, I discovered that a sling I devised primarily so that I could carry my saw on my last project, without taking up any hands, also makes it much easier to use it one-handed, using the sling to help support it. I wasn't thinking of that potential benefit from the sling when I devised it; I was just thinking of being able to carry my saw while leaving my hands free.
Big Milwaukee fan and have some Dewalt stuff.
The Red is much better.
First remote cabin I built with DeWalt battery powered tools; saw and drill.
After that only Ryobi.
Why?
1. Batteries lasted longer and cost less. Unlike some other brands
the battery design never changes as fit is concerned though there
are periodic longevity/power improvements.
2. Less expensive; important when tools are stolen - a frequent thing.
3. Stolen less often. Thieves seem to like yellow better than blue.
My perception of Ryobi is that it is professional grade, but cheap, in the very worse sense of the word. They perform well, while they last, but they break or wear out much more quickly and easily than better brands. I mostly see them as tools that a company provides in large numbers, for the workers to use, who might not have their own tools. I suppose this might account for my perception of their poor durability and longevity; as it is a sad fact that most people don't feel nearly as obligated to take good care of tools that don't belong to them as they would take of their own tools. Of course, their cheapness would also certainly be a factor in a company choosing that brand to supply in contexts where they are more likely to be subject to being lost, stolen, or just not well cared for.
I'm one who leans towards different brands for different power tools. I like certain brand drills, and might prefer one brand for 1/4 drive, another for 3/8th and yet another for 1/2 inch. You just can't beat the Milwaukee 1/2" corded hammer drill.
I would never buy an entire line of tools all from just one company, as a result, I own power tools from many brands. Some brands that were great years ago are not as nice today and vise versa. I have a very old table saw that is 100% MADE IN AMERICA whose line now is cheap. I've just never gone out and searched for any tool that I was attracted to the Dewalt line as the best fit for my needs.
Of course, having different brands mean you need different sets of batteries and chargers for each. As it is, I have my two DeWalt tools, along with batteries and chargers for them, and I have a separate Black&Decker drill, which has its own batteries and charger. I haven't given it much thought, before, but I wonder if, somewhere out there, there's an adapter that would let my Black&Decker drill use my DeWalt batteries or vice versa. Since it's the same company, the same kind of battery technology,and the same operating voltage, I'd bet that the two battery systems are electrically- and electronically-compatible, but just with different connectors for no other purpose than to keep the two markets separate, by preventing one system's batteries from being used on the other's tools.
In one direction, being able to use my DeWalt batteries on my Black&Decker drill would free me from having to carry the separate Black&Decker batteries and charger. In the other direction, being able to use my Black&Decker batteries on my DeWalt tools would give me that meager extra backup, just in case I managed to use up all my DeWalt batteries in one day, though that doesn't seem likely, and if it did happen, my Black&Decker batteries really wouldn't add that much. If I am having so heavy a day that the 10½ amp-hours of capacity that I currently have in DeWalt batteries is not enough, less than 3 aH that I have in my Black&Decker batteries probably still won't be enough after that.