Hi there!
If you haven't done so already, go along to the relevant Open Days and have a look around Reading and UCL. Listen to what each Uni/course offers and ask questions. Reading is acknowledged as a top global centre for real estate teaching and research (a friend of mine in the industry called it 'The Manchester United of real estate research'...when United were the top club!), whilst UCL has a wider reputation as 'London's Global University' with it's renowned built environment faculty (The Bartlett School). Particularly think about the university environment you want, the course content and options, academic strengths/depth, the extra-curricula offer and job prospects.
Good luck!
Joe Doak (UG Admissions Tutor at Reading)