Possibly, regional differences in taste and all...from what I've experienced over the years, the light is more tempered in terms of actual maple flavour and has more interesting notes like vanilla and marshmallow. The darker my syrup gets, the more I get a stronger maple and then a noticeable tone of brown sugar/molasses/coffee (all acceptable flavours on the Flavour Wheel btw).

I don't sell my syrup, I either give it away or barter for other regional goodies, and will describe to recipients what kind of things they can expect to taste in certain batches of syrup. Lots of people try and like the light marshmallowy/vanilla, but even more love the more developed mid-run maple flavour and the late-season coffee/brown sugar/molasses.