To quote the guy at the KCL open day: "As for the quality of our degree vs that of UCL's, you couldn't put a piece of paper between them".
I like UCL because of the method of assessment and the ability to take courses from other departments, or study with a language. I also like the amount of intellectual history courses they have, which is by far my favourite type of History, which I feel KCL had less of.
UCL does still use the tutorial system. They may not occur every week as they do at KCL, but that's because at UCL you don't have a weekly, unassessed essay requirement. Personally I would not be interested in engaging in essays on a weekly basis, especially as they would have no bearing on my final mark. You do get tutorials in your first year at UCL, and generally seminar class sizes are small. The web is just one of a variety of methods used to contact tutors, who also have office hours whereby one can book private appointments.
Also, I like the fact that the UCL History department is in a nice, big, bright period house!