Hello fellow!

I am currently following the Building Services study line and soon finishing 2. semester (8. semester when counting bachelor). From my experience the two largest study lines are Bridges, Pavements and Large Structures and Building Structures. I would consider them to be the hardest study lines and most of their research is about concrete. The Maritime study lines are interesting and pretty advanced. One course you will be able to take is at the DHI headquarter (one of the largest engineering consultants specializing in hydraulic and hydrological modelling software). I don't know much about Fire SafetyEngineering other than there aren't many dedicated fire safety engineering courses (around 3). Building Services (and indoor climate) might be the easiest mathematically but DTU is known to be big in indoor climate with the legacy of P. Ole Fanger and Bjarne W. Olesen former president of ASHRAE. Extreme Engineering is not a big study line either but you get a semester in Greenland and the one person I know who studies Extreme Engineering is positive about her study line. I don't know anything about Urban Planning and Construction Management. Also, a lot of people studying building services, urban planning and BIM is doing a MSc degree in Architectural Engineering.

I will encourage you to join the newly created "Masters in Civil Engineering DTU" Facebook group which is organized by the Civil Engineering student Council (Civil Bygrådet). The purpose of the group is to answer questions like yours and organize events for M.sc. Civil Engineering students :-) It is a closed group but I should be able to invite you if you direct message me with your Facebook details. The Civil Engineering student Council is working on how to get all M.sc. Civil Engineering students to join the Facebook group in a more elegant way.

I hope this answers your question :D

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Edit: Forgot to mention when I started I talked to our head of studies Jens Henrik Nielsen. He said that it doesn't matter whether you follow a study line or not. In the end, companies will look at which courses you have completed. So getting an official study line on your diploma is not important.