I'd center the sink under the windows always. Then it depends on the faucet and style. Any other artillery on deck? Sprayer? Soap dispenser? Hot water tap? Faucet placement is partly a function of the length of the arc. I'd want to be sure it's long enough to reach both sinks and nothing impedes the swivel. Alternately, you could do a faucet plus a small tap for the sidecar or even a pair of english taps there. Some very cool possibilities.

Go biscuit or almond if you don't like white or stainless, but PLEASE don't go with the black Kohler, you'll regret it. I had one in a previous house. It was not the apron front style, but it was a tile-in double basin. It's made the same, I think it's enamel over cast iron. We were on city water which was very hard, the house also had a water softner. The house was one year old when we bought it, we were the 2nd owners. We lived there for 2 and a half years, so it was only 3 and a half years old when we moved. The bottom of the sink was discolored and badly scratched. It looked like a white and blue-ish film on the bottom that could not be removed. It was so bad, it became something we had to give a credit for when we sold the house. We didn't replace the entire sink because it was tiled in. It would have been very hard to remove without damaging the tile. Our move was fairly quick (job relocation), so we didn't have the time to deal with it. We never used abrasive cleaners or things that would scratch. We had a professional Kohler refinisher come out and tried to get him to re-do it. He refused, saying that the black would just do the same thing in a short amount of time. He said that the black was the worst color Kohler makes for scratching.

70/30 and 60/40 are almost worse than 50/50. I dunno... After only having 50/50 my whole life (all 36 years of it, lol), I'm quite impressed by my experimental* 70/30. :-D The disposal is in the smaller section (kind of a pain), but the smaller section is closer to the stove, so it's not too bad. My colander perfectly spans the small section, so when I'm draining pasta, nothing touches the bottom of the sink. Which is really nice. I hand wash very few things, but I don't fill the sink up to do it (soapy sponge and slowly running water do the trick for me). All of that said, my dreams are filled with copper single basin sinks, so that I only have one disposal and one drain to clean. :-) [*experimental -- trying it out in the tract house we just had built, because I wanted to convince the husband that there's more to life than 50/50, and the builder wanted far too much for the single basin upgrade; the ultimate goal is to do single basin in the custom house.]

I had a stainless sink once and disliked the constant water spots. People have different design taste - a good thing or the world would be very boring. I have a cast iron Whitehaven and like it very much. However, there are different types of apron front sinks and they install differently, which is why it would be important to post the brand and if possible a pic. Joesph Corlett is a good pro to contact, though he usually sees and responds to post about sinks. https://www.houzz.com/user/joseph-corlett