I have chains ranging from 4 to 20 feet. It's nice to have a selection plus some things need more than one chain to be used at a time. For instance, to pick an implement it is handy to use one chain as a bridle to hang it level and grab it with a second chain so it can easily be rotated. While working alone, some loads like poles need two points of attachment because they won't balance on their own.
When in doubt, I grab a longer chain than I think I need. With the bucket attachment method I've been using for the last 10 years the extra chain can be kept out of the way easily by dropping it into the slots that aren't used for the load. The attachments are short pieces of angle with slots that accept up to 3/8" chain. They've seen loads heavy enough to get the rear wheels off the ground and were never affected. Here are pictures showing the buckets of the (now gone) B7500 and the L3200: