Indeed most of my more "tool"...tools...are Ridgid 18V. All my impacts are Ridgid (except one), also have two Ridgid drills, an impact driver, along with sander, router, recip saw... The ONE+ stuff I have is mainly things like lights and fans, along with a couple polishers. Don't have any ONE+ drills, saws, etc. 40V I have a couple lawn tools and the inverter, mainly because Ridgid don't sell much of any "OPE". Milwaukee M12 I have stuff like ratchet and the one right-angle impact, along with a drill, heated jacket...
I'd pretty much always take Ridgid Octane/MO over Ryobi when it comes to the more serious stuff. There's only very few cases where a Ryobi HP tool outperforms a Ridgid Octane/MO tool, and when one does it's usually because the Ridgid tool is just a few years old and they haven't put a new one out yet. Case in point is the mid-torque impacts...the R86011 is indeed a little below the P262, but now that the R86012 is out, it's beating the Ryobi (there's not a huge margin between any of these though). Also things like the circular saw and grinder--the HP are good but are no match for the Octane equivalents.
There is no denying there is some crap ton of other stuff in the ONE+ lineup. I originally had never intended to get into ONE+ at all, and it was basically the last of the modern cordless "platforms" I got into, because every time I'd consider buying Ryobi the above dilemma presented itself--no point in buying Ryobi when there's probably a better Ridgid tool for which I'd already had several batteries and other tools. But I think the thing that finally got me was a lawn tool--got the [brushed] ONE+ hedger for like $40 after return in a promo, and the rest is history--just started picking up all kinds of nicks and knacks in the ONE+ realm lol. If I count the number of things I have in any one battery platform, I probably have more ONE+ than anything else now but none of them are "serious tools", and that's kind of the beauty of ONE+--there's just so much in it, so many nifty and useful devices.
Just a word about M18... M18, to me, is just way too expensive. You can get stellar deals on both Ridgid and Ryobi, and even M12. But M18? Even the "deals" are still pricey--like 50%+ more money for a given tool. M18 stuff is most often the best of the TTI group tools, no denying that. However for the increase in cost it's simply not worth it over very good performing Octane/MO and HP tools which are had for much less money.