I have the same bags as Just, with colours swapped. I bought the Crimson Tri-Star because it was the only colour in stock at the time I needed one. While I procrastinated about placing an order - and all colours were in stock - my heart wanted Indigo, but my head wanted Steel. If I were to buy it again, it'd be a tough choice between Steel and Navy. I think a subtle exterior works better for the more business-oriented Tri-Star, but I love the solar dyneema interior and (rightly) that wasn't an option with Crimson.
When I heard that Indigo was to be discontinued I grabbed one of the last Aeronauts in that colour. I figured if it was too bright I could always return it unused and get the Steel instead. I never did have a second thought about Indigo once I opened the box. For casual travel, it suits me down to the ground. And for longer business trips it doesn't get hauled into the client's office the way my Tri-Star would as an oversized laptop bag.