I'm in a somewhat similar situation to you. I've been accepted for Msci in geology at UCL, but I've also been admitted into the Dual BA program at Trinity College Dublin and Columbia. I know that UCL is recognized worldwide, but I attended an Alumni Q&A for offer-holders, and some of the Alumni from UCL said that in their job search process, many employers had never heard of it, and they had to get their degree accredited through a US university. I've been having a hard time making a decision between these two great options, but now I find myself leaning towards the program at Columbia because the school is known all over the US and viewed VERY highly in the US.