As you can see, stainless is now overtaking aluminum. I expect this trend will continue as I believe it's a bit late for this kind of poll. Folks waiting for their series 4 watch are more active on the forum at the moment, looking for news on shipment updates and information from others . Since there are delays with most stainless models you'll see more responses for those customers.
I also expect, even with the higher cost, there is greater than expected demand for the stainless models.
I also think posters here are substantially more interested in Apple, and the watch, than the general population and that might skew toward the higher end stainless.