I've not been to either of these museums, but they both look interesting to me. Unfortunately, on my next visit I'll probably only have time for one of them. Has anyone been to either or both? Anything that might sway me one way or the other?
My vote is for the Cartoon Musuem. Reason (s)? Gillrays ghost. Seeing London's and world history thru the eyes of a polical, satirical cartoonist is fascinating. Secondly, I know I can enjoy tea and something sweet before hand at Beas of Blomsbury or enjoy a pub lunch at the The Ship Tavern. Have fun.
We went to the Cartoon Museum last July and enjoyed it -- it is small and compact and had wonderful illustrations and satirical drawings! It is on the way to the British Museum if I am not mistaken.