Seems most of us are happy with which ever we wound up with, but none of us has gotten together to run them side by side.
Like everyone else, I went with the battery platform. I only have two chargers ( a 40 and an 80) in my garage wall.
In my shop, I am now down to 18V Makita and 12 V Milwaukee. Gone is the PC, Bosch, Skill, generic flashlight.
I will suggest again, as I see a trend in tools, look at the higher voltage tools for heavy duty. Sure E=IR, but that I gets to be pretty high if the E is low. We don't see many 3V tools any more. No 6 V. I suspect at time passes, the 12's well fade away as they can make a higher voltage, lower current stack do the same work easier. Where 18V is common, we are seeing 36 and 40's in hand held's. I suspect we will see more 80V in garden tools.