SC52 seems to get you the highest output on a 14500 (280 lumens). Another option is the Quark QPA. It should be over 200 lumens. If you really want to get the most output, you could buy a QP2A-X (the XML2 version) and a single AA tube for it. That should get over 300 lumens on a 14500 battery.
The SC52 does 280 lumens with an Eneloop - with a 14500, it does 500 lumens (albeit only for one minute before stepdown). Honestly, for an EDC, how often do you need more than a minute on high anyway?
I kind of collect in the 1xAA/14500/efficient/sub-lumen category, have both lights (as well as many recommended above), and test lights with both a light meter and stopwatch. You really can't compare spec sheets between these two manufacturers since they sit on opposite ends of the conservative vs liberal ANSI interpretations. SC52 specs (output and runtime) are nearly identical to the 2-cell QP2A-X across most modes - but their performance is certainly not and can be easily seen if you overlay Selfbuilt's output/runtime graphs. On the lower end, incredibly, the SC52 claims to be 30-50% more efficient (runtime) on the SAME 0.3 and 3 lm modes as the Quark, and with less than half the battery power! Well, this is how they do it:
That said, I do find the SC52 ~ 25% brighter than the single-cell configured QAAX on an Eneloop or 14500, but you'll need equipment to see it, and the lumen increase is mostly offset by runtime reductions - ie, both seem more or less equally efficient. Disregarding the conservative/exaggerated marketing claims, these two are the best I have found in the AA/14500 category. Losing, or significantly shifting, the lower modes on 14500s (many lights recommended above suffer this), and the inefficiency of magnetic rings, are deal breakers for me. The SC52 wins on size, cost, "nicer" build quality feel, and UI/modes. The Quark AAX wins on battery versatility (both chemistry and configs - ie, IFR, IMR, CRAA and 2xAA, 1xCR123, etc), durability/reliability/field serviceability, warranty and customer service (US).
I personally prefer the Quark.