Carbide gray looks more blue in pictures than in real life. It does have a bit of blue in it, but it's subtle, IMO. You are right that the twilight looks brighter in a bright light than in other conditions. I still wouldn't call it a baby blue. It's definitely a gray blue, but there's a hint of blue/purple flash in some lights. Have you seen them in person?
I went with twilight, literally, because that's what the dealer had in stock. I really wanted a color, not a grey, silver, or black. So that's what they had. I couldn't wait for factory because my old car was totaled and I was in a rental. I have grown to love the color, although I didn't love it at first (I actually thought it was too flat).