I've spent some time in the last week moving from LibraryThing to
Goodreads. I've never found the LibraryThing interface all that convenient to work with, and in the end the fact that tagging didn't work at all on a tablet pushed me to switch. In the process I discovered some big gaps in the form of reviews that had been written up only on LJ, so there was quite a task of updating. The later updates didn't change my recommendations noticeably, but the feature does seem to work quite well.