i myself prefer the video_ts folder for hard drive storage. however, as far as i know, dvdfab offers two other 100% quality options.
save as an ISO file or use the dvd to mobile option VOB passthrough.
to save a dvd as iso file, please click on the ISO icon next to the target selection
to use vob passthough:
please select the dvd to mobile option Generic
select a source - click next - click conversion settings
for device select VOB
now i am new the the VOB passthough method, so i dont know exactly what players will work and what type of processing can be done with the resulting files.
maybe some will come in and let us know.