from SanskritFritz's German posts:
I have compared a 2M file and a 2k file with Beyond Compare and with ExamDiff. BC finds 6, ED over 10 (correct) matches! BC is faster, but probably the comparison buffer is too small, even with option "Sync quality: Slow and thorough".
... Beyond Compare has features, which ExamDiff does not have, but in this special case (where the difference between the two file sizes was enormously large) ED was the winner, even in the [ED] freeware version!
I agree that, under these conditions, BC's text comparison algorithms could use improvement, and I understand that the authors are working on this issue for the future. I use BC constantly to compare both folders and files because of its depth of features, strong user interface, and configurability, but I'm very glad to learn about ED for use comparing very asymmetric files.
(Please excuse my returning to this subject so often: as with TC, BC is one of the programs that I consider to be a an indispensable, always improving, miracle!)