In some ways it's really funny seeing everybody's comments because whilst they're so similar it also reiterates that one light doesn't work for all situations and gives us flashaholics justification for buying many lights depending on what you want them for :twothumbs
That said whilst I had the SC600w Mk III Hi I've literally only just got a SC62w which I had to have as I thought this would be the most ultimate light in the world.
Whilst I prefer the SC62 as it's that bit smaller / better for the pocket I probably prefer the beam of the SC600w Mk III Hi ... One of my main 2 uses is walking the dog down a dark lane in a countrified area and whilst the majority of the time either would be on medium ... if you hear something in the distance ideally you want some throw and there is quite a difference between the two.
I've used the 600 quite a bit as a bike light so again be interested to see how they compare but I really did take on a comment from JLeephoto in post #2
I skipped over the the SC62 with the reasoning that both it and the SC600 are bigger than I want to pocket EDC so I should just as well get the larger light. So I edc a S1 baton or SC52, but when I go for evening excursions the SC600w is the light I grab. I love the tint and beam profile as an all rounder and run it at M1 or H2 with the occasional H1 to check out distant objects and the battery seems to last forever.
Maybe if you have a really good AA then it's just a choice of which beam profile you prefer for an 18650 because again it's down to what you want to use it for ... either you grab the smaller and lighter AA which is better in your pocket in case you need a light ... but if you know you're going to be out in the dark the marginal difference in size becomes a bit irrelevant as it'll be in your hand anyway.
Gosh .. decisions on which light's to buy and keep ... all of them
.. and that wouldn't be enough