Get what makes you happy but if you’re thinking of eventual resale, you can’t go wrong with stainless (they make a non-fingerprint version).
As others may have mentioned, you can get panels that match your cabinets, if you like a cohesive look. They can be removed if the next owner prefers to see the appliances.
I love the colors but it’s hard to anticipate how they will be perceived in 15-20 years and whether people looking to buy your house will like it (kitchens and closets sell houses!)
I DO like the trend where people are getting their oven in a color as kind of the focal point of the kitchen (with a custom hood over the top and a killer backsplash). It works especially well with the larger size ovens.
I’m not a fan of white unless the whole kitchen is white and you’re going for the clean modern look (again, that may not appeal to buyers).
They are making a matte black, almost charcoal color now that I also like. No to the glossy/shiny black.