Soapstone doesn't discolor, period. It has a matte surface which is usually sealed and enhanced with a coating of food-grade mineral oil. It gets to looking a little glossy after four or five applications (once every other month) and is resistant to scratching and chipping. It's still used in chem labs for the simple reason that it doesn't react with anything for the most part. Hydrofluoric acid, probably, but not even Ferran Adria has found a use for it in his advanced cuisine.
Silestone is ok, but it ends up looking, well, like a manufatured product. It's a question of esthetics - prices are nearly identical. Granite is a bit more sensitive than Silestone or Corian, marble is much, much worse.
Viking ranges were dreamt up by an upscale tract home developer. Wolf has a lineage of restaurant equipment. Viking's not in the top three (or five) imho. Can't go wrong with Thermador, unless you like standing on open oven doors...
I hadn't noticed the dimensions of gas vs electric ovens. If it accomodates a standard large baking pan, I'm ok with it.
Cleanup of the drip pan is not a prob for me, the utility and construction of the range is. Whilst living in NYC, one salesman demonstrated the frame construction of the Wolf by opening the oven door and standing on it. Besides that, my lovely wife loves the red knobs. I just like to cook on them.
Yep, Miele and Bosch and Fischer and Paykel are dear, but if you that esthetic is important to you (admittedly it's minor), but you're building a dream kitchen, aim high. There's nothing wrong with the other brands unless you're obsessively focused on the details, like me...
Grill vs griddle, the great debate

. There's no right answer, only opinions. There are no wrong answers...
I'm a dedicated outdoor griller with gas and charcoal, bbq-er and smoker, plus I have an outdoor wok burner and have been known to bury a kimchee pot or two in the past few years. But for me, if I want a few cebollitos or grilled aubergine and courgette to accompany dinner, and I often do, I'll take the grill anyday.
Grill marks indoors, someting no broiler can provide. No fuss, no ten to thirty minute wait, no trip outside in Chicago's -20 to +105 cold / heat.
The griddle imho is grease collector and a poor substitute for a french top. If only I had the room for a 60" range, French top and six burners.
Hate to try and explain the French top to a potential future owner, though.
Think about the house, it's architecture and your personal taste. Maybe enlist the help of someone who thinks about this for at least forty hours a week for forty-eight weeks a year. It makes a difference.
All the best,
Marc