I've had better success using Capture Now, and never have any real problems with sync, TC, or anything, unless it's related to dropouts on the tape. On the other hand, whenever we have tried to use Log & Capture, I have encountered problems arising from lack of sufficient handles on the tape... particularly prior to the initial in-point. FCP seems to want 2-3 minutes of unrecorded tape prior to the first in-point, and I usually don't remember to set my tapes up this way prior to a shoot.
But my business is primarily shooting dance recitals with 3 cameras, which we capture and edit using MultiClip, so continuous TC is needed to allow all the tapes to remain in synch. If you are shooting numerous takes of individual scenes, you'd be better off to use in- & out-points, so long as the handles don't become an issue.