For cordless tools, I started out with a single Bosch Green 14,4V drill, then an 18V. Then I needed some actual drill power and went with a Makita 18V drill.
Prices and availability put a quick stop to further Makita purchases, so I landed on Dewalt 18V. Supplemented by 230V tools of various brands.
Best part about Dewalt:
Reasonably reasonable prices. Mostly good quality and power for the money. Tools are well balanced, feels good in the hands to hold over time, and feels well built.
Worst part about Dewalt:
Questionable quality for their drill/driver chucks. I have had issues with wobble in the chuck on all 3 of my drills (DCD991, DCD796 and DCF601). And I've heard similar stories about their impact series, such as the DCF887, which was long on my wishlist.
I'm not a professional in any way, I just like to have everything I need or might need on hand. "Excessive homeowner" is perhaps my best description.
Current tool collection is this (got some inherited older tools as well, but these I have purchased myself):
Dewalt DCD991 - drill, 18V
Dewalt DCD796 - "hammer" drill, 18V
Dewalt DCF899 - impact wrench, 18V
Dewalt DCF601 - driver, 12V
Dewalt DW343K - jigsaw, 230V
Dewalt DWE6411 - sheet sander, 230V
Makita SP6000J - plunge saw, 230V
Hitachi (Hikoki) C8FSE - sliding miter saw, 230V
Metabo SXE 425 Turbo - orbital sander, 230V
Black & Decker KG2000 - 230mm angle grinder, 230V
Metabo WEV 11-125 125mm angle grinder, 230V
Stanley D200/8/24 - compressor, 230V
Dremel 4000 - multitool, 230V
Karcher WD6 P Premium - vacuum cleaner, 230V
With my latest aquisition being this:
Bosch GST 160 CE - jigsaw, 230V
I've found myself using a jigsaw a lot lately, so I wanted to get the best one I could get my hands on.
On my wishlist:
Dewalt DCF922 - compact impact wrench, 18V (will replace the DCD796 drill)
Accessories:
2x Makita MakPac 1
8x Makita MakPac 2
1x Makita MakPac 4
Makita 199141-8 - guide rail for the plunge saw
Makita 194385-5 - guide rail clamps
2x Dewalt DCB184 - 5 Ah batteries
2x Dewalt DCBP034 - 1,7Ah Powerstack batteries
Ear plugs in every MakPac carry case, in case I don't have full size hearing protectors available.
Big box with various screw cases
A lot of spare sander sheets
Plenty of bit sets, especially the Dewalt DT70734T FlexTorq
Several Dewalt DW2547IR and Dewalt DT7508 socket / hex-adapters
Bahco 7806 17mm, 19mm and 21mm impact sockets
Bahco BH13000 jack
Bahco BH33000 jack stands
Bahco S910 socket set
Several Bahco 808050 screwdrivers
I find it a bit ironic that I started out with Makita as the "professional" choice, and ended up using only their carry cases.
But the Makita MakPac series is SO handy! Choose a case size, get the insert you need for your tool, almost regardless of brand, and you can fit the tool AND any accessories you might need! Such as measuring tape, ear plugs, drill bits, driver bits, adapters etc. The cases also stack, and can be locked together.
Much better than Bosch or Dewalt's solutions, where you can fit the tool, battery and charger...and that is it.