All good points. For me, the outside is the outside and the inside is well, the inside. They have little to nothing to do with each other. Get what you like. I would never own another black interior ever again. Too hot in the sun. If you have kids I can appreciate the problem of a light interior. I can tolerate a little grime and marks in exchange for not getting my butt baked on a hot black seat. (BTW Goo Gone cleans that stuff up pretty nicely.)

Same for exterior. Black and dark colors get too hot in the sun.
Try putting your hand on the same spot on two cars sitting out in the sun at the dealer. You'll see how hot the dark color is while light colors (white is best but harder to keep) are much cooler. If your car will never see the summer sun, you got all your options open.