I recently hiked the Pacific Crest Trail from Kennedy Meadows to the Kearsarge Pass trail then out over Kearsarge Pass. At almost every campsite I passed before Crabtree Meadows, there was at least one bear bag line stuck in every suitable tree and some others in the damnedest places. A lot of them still had pricey-looking carabiners attached. From this experience, I suspect that the best bear bagging line would be the cheapest because you could easily be leaving a fair amount of it hanging in trees along your way. This, incidentally, sort of offends my sense of LNT.
I, too, use a bear canister if bears are likely to be a problem.