Well this is a very deep rabbit hole to go down, but as you asked here goes -
First cordless a B&D 12v pro bought 30 yrs ago lasted well till batteries no longer available, then switched to 12v DeWalt, built up a reasonable basic tool set , drill , driver, right angle drill, small circular saw , [trim saw] grinder, then all got nicked after 15 years use , just as the 3 generation batteries were dying. Stepped over to Makita 14.4v as this was less likely to get nicked when working on site, everyone else were using 18v. I had more or less the same tool set , drill,driver,right angle , multi tool , grinder and jigsaw. My car got broken into and all was taken - so I stepped over to 18v makita as I borrowed a mates set up in order to finish a job off.
These were pretty good , loved the barrel jigsaw and their multi tool. The rest well as I've got bear claws for hands just did not sit good in my hands.
Went to the states to work for a year and had to get some cheap cordless tools for work , grabbed a set from HD big box store - Ryobi 18v+ old stuff blue plastic - in 2005 lasted yonks, still got the under powered trim saw. Stepped over to their green kit, got more of the tooling sds light weight drill - great for 4,6 8 and 10mm concrete but over heats on 12mm plus. Multi tool with vari head - great for cabiinet fitting into tight spots, jigsaw ok not barrel style. Their screw guns are great, especially the AIRSTRIKE models they are quieter than all others - not got 3 , Drills - all ok , trim saw not replaced yet , but on my list.
Worst thing about Ryobi the garentee is not worth the paper its printed on as a " pro user " my tools have no garentee but as a diy'er no problem 3 yrs ??? WTF !!!
So, you pay your monies and takes your risk. I reconmend you go LOOK and TOUCH what ever make/model and then think about usage light / heavy or trade. Then buy what you need.
Hope this helps.
Karl