I like the u series of Sinn too especially U1. The minimalist design is cool and the lego hand is one of its kind. I like it so much that I have one regular U1 and another black U1 (Tempus version)!!
Let's forget about movement, history, brand, price, etc for the moment and just on design, which is the best designed watch in the category of dress, sport, diving, aviation and casual. For me, they are: Dress: GP 3 bridges Sport: AP RO Diving: Bell&Ross BR02 Aviation: IWC Big Pilot Casual: Panerai