I'll start by saying all these tools have been used professionally. We are hard on them. Regularly running #14 x4" screws into wood and #14 drill and taps into steel, 3" hole saws and 5 days a week. This is also over the last 20 years.
I started with DeWalt. They were great for about 6 months. I fought them for another 6 months, stripped a gear box and pitched the drill off the top of a 12' ladder. This was on a job in South Georgia in the middle of nowhere installing 11 door packages. I finished that job with a corded drill and wasn't very happy about it. That was the end of DeWalt for me. At the time I was working for another company and that was what they bought. They were a continuing problem for as long as I worked there. Granted this was probably close to 20 years ago. I'm sure they have improved.
Next up was Bosch. Great drill. Except their trigger only lasted about a year. Then all you had was high speed. Moving on.
Hitachi. I got almost 2 years out of their drill and impact. Great batteries, impacts are perfect, the drill clutch sucks and won't hold a setting. These still exist in my home shop. They are going on 15 years old. The batteries still work. The drill still sucks. I don't mind fighting it at home, but they are useless on the job.
Makita was next. Great drill and impact. Probably some of the best in the business. Unfortunately, their batteries are crap unless you treat them like glass and they are stupid expensive. The tools will draw the batteries down far enough the charger won't charge them. After killing 3 batteries over a year, I gave them to my business partner and he uses them in the warehouse. They will last forever in that environment.
Ridgid was next. Outstanding stuff. Lifetime battery warranties, and tools that take a serious beating. These are what we use on the service and install trucks. I think we are up to 5 drills, 5 impacts, 2 rotary hammer drills, 2 circular saws, 2 demo saws and 2 grinders along with 15 or so batteries across 3 trucks. The drills last about 2 years before we destroy them but they are cheap enough to replace we just buy new ones when they die. The rest of the tools just keep working. In the last 8-9 years we haven't had one battery failure though a couple of the originals are getting a little tired. A bullet proof system. We will be sticking with them for the foreseeable future.
The last set I bought for me was the Milwaukee 12v drill and impact. I had tried Ridgid's 12v setup and they are very light duty. The Milwaukee tools are much better built and the drill has a 1/2" chuck. I've been very happy with them as well. I don't use the tools as hard as the other guys do.
The Hitachi set at home is ready for the bin. They will probably get replaced with a Milwaukee 18v set sometime soon.
Edit: There was at least one Ryobi drill in there somewhere several years ago. It was decent but not near durable enough for what we do with them. The gear box got so noisy we couldn't use it in the hospitals so I gave it to one of the guys.