Is there any difference between the two in terms of quality or sync? I am going to be doing straight muxing but I notice that with MakeMKV it attempts to resync video by dropping frames and noticing and attempting to correct drift when possible. DVDFab at least does not display such messages, but I don't know if that means it isn't doing it or the errors aren't there. It makes me wonder if two straight copies from a Blu Ray source using each program could result in different videos (though negligible).

Is there a preferred program?