Hmm ok had a good bit of experience here in the field of cordless drills so heres my input.
Dewalt.... very strong, reliable and durable cept for one thing ... the batteries. While strong and able to do the job if you severely drain them and recharge them alot they will have a tendency to die out on you and be worthless. Now alot of the batteries out there are like this but the big problem with Dewalt is the fact of their price. Most often then not if you go to replace the 2 batteries that come with most kits you can buy a whole new drill kit for less then 2 batteries alone.
Bosh and Makita make good drills that don't seem to be plagued by the battery problems of Dewalt and on a whole are usually less expensive. Bosh also has a very tough drill that holds up well from people who are generally clumsy and drop things alot.
As for B and D they are just a cheap version of the Dewalt .. as said before they are the same company.
Worx... never dealt with them.
Some batteries out there have the capability of just changing the inner core thus saving you some money. Dewalt is one that is not capable of doing this with.
Depending on the type of work you are looking to do with your drill (.. i.e. drilling lots of holes with a spade bit or just running screws into projects... ) would dictate the type of drill you would really want to have. If your just doing small stuff around the house a smaller voltage drill would do you just fine. If however you are going to be doing alot of heavy construction then go with the big guns as they can handle it better.
Another consideration is weight. The Dewalt 18 volt and 24 volt are some of the heaviest if not the heaviest cordless drills out there. If you are going to be working with this drill for a very long time keep that in mind as it does wear on you very quickly.
Keep in mind buy a drill for what you are going to need it for, not as a status symbol of having the biggest and baddest out there. In alot of cases you will find that a heavy duty corded drill will serve you better then a big voltage cordless. They last longer don't lose power and in general are normally cheaper.
Hope this helps you some in your choice!
