Been using a 4iiii left crank for years and it just works. Not in your list but figured I would throw it out there.
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For me, the concern was not so much truer accuracy as the ability to verify two(or more) power meters are calibrated the same.
Iām sure factory calibrations have improved and will continue to improve, and no doubt P2M is a good product etc etc. But if down the line you end up buying a second one for another bike, and you suddenly break all your power PRs, and you start wondering āI wonder if my new PM reads a bit higher than the the old oneā¦?ā there is nothing you can do about it.
Some people are fine with this situation. Other people (OK, I trained as an engineer 
) are not.
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This. Then you can run whatever pedals suit your fancy. I switch from SPD to flats in the winter on my gravel bike so I can wear boots when its really cold or wet. Its among the cheapest options and it just works.
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How are people liking the Stages Left side R8000 power meter?
Switching from my 1x Allez Sprint with a SRAM Road Force and a P2M NGeco to a 2x Allez Sprint with a R8000 group set, and will need a new power meter.
Iām sure there are plenty of folks who will recommend Stagesā¦but from my experience Iād stick with 4iiii. I had a Stages GRX left side PM that read very high (like 10% more than my trainer and the Computrainer my coach at the time was using.)
4iiii allows you to scale the power if needed. If itās way high/low compared to another source you trust, the scale factor helps keep things more consistent.
Iām currently running a 4iiii R8000 crank PM on my Roubaix and itās been flawless.
Some interesting takes here. First, Assiomo cleats are nothing more than Looks, theyāre just fine. Any concern is a non-issue (I have Assiomo on one bike and switch them between road and gravel rig). P2Max is the first unit I got 6+ years agoā¦bomb proof. Itās threaded/GXP BB compatibility, so limited to what bikes I can put on. Currently on my trainer bike, and will stay there. I have a Stages Dura Ace Gen 3 left side only on my Colnago (came with the acquisition) and that has been extremely reliable and simple. Finally, a pair of PowerTap pedals out on loan to a friend - these were dual sided and right crapped out after two years, but left functioning fine. Across the four brands, they are very consistent and accurate.
regarding static testing, thatās immaterial. Itās the consistency of the reading on whichever unit you choose. 1-2% +/- margin of error for accuracy of 270 watts is 4 watts. As long as that remains constant, youāre just fine. All the makes and models listed are very reliable. Choose your poisonā¦I prefer the Assiomo as I like the cleat feel of the Look style.