- GS body is larger and "bigger" sounding acoustically, uses medium gauge strings, and the ES2 is a hit or miss with folks. Maple offers wonderful, prominent fundamental tones and makes for a punchy "forward" voice. Good guitar that would certainly not disappoint.
- GC is shorter scale with lights so will be "lighter" to the touch and more responsive, will not have the total volume and projection of a GS with mediums, and has the ES1.3, the best-sounding ES they make, IMHO. Coco is a beautiful-sounding wood, typically just gorgeous that I've always heard in my hands, and we're also seeing less of it as time goes. This along with the "Ltd" status offers if more "appointments" (typically gotoh tuners, nicer aesthetics) that make the guitar more "special" in my mind.
So long as you like the tone, I would go for the GC in coco, hands down. If you want "louder" just plug in and the ES will deliver beautifully (and better than the ES2 to my ears). But the overall voice (as far as "specs" but also my limited but experience with coco) of the GC make it the choice between these two, as well as the more "personal" feel of the smaller-bodied GC, and a clear choice for me. And in live use for your duo, I would clearly prefer the ES1.3, not to mention the GC body: it simply amplifies very well! The GS maple is a very nice guitar, bar none, but it would be easy to find should you want to scratch that itch in the future. You're asking for opinions, so you'll get many. Trust your ears and your hands: go with the one you'd rather play. But since you're asking, I'd easily go for this particular GC Ltd.
Edward