Your basic choices are:
1) standard version (AAA-CS) that was the premium version til a few weeks ago. Around 6 lumens with the familiar Nichia blue cast.
2) premium version (AAA-DS), 15 bucks extra compared with standard version, and about 50% brighter, and maybe not quite as blue
3) snow version, 10 bucks over the standard version, about the same brightness, more beam artifacts but much nicer tint, close to neutral white.
The usual CPF motto in this situation is "buy 'em all". However the Arc AAA reality is that it's a KISS light that you can bring with you everywhere, that is a reliable source of close-up lighting that doesn't attempt high brightness. Therefore, paying the 15 buck premium for the DS led seems to me mostly like a connoisseur's choice. Of course as a connoisseur I'll probably do it sooner or later, but I've so far resisted (I got the CS and snow versions). I think there is a plan to drop the DS price by 5 bucks once the DS leds are less scarce.
I'm possibly in the minority among Arc AAA users but I'd say if lumens are that critical to you, maybe you should rethink whether this is the right light for your requirements. So I'd get either the standard or snow version depending on how much you care about neutral tint.