Depends on your conditions. If you have no humidity problems at all, then leaving the sugar leaves on for drying promotes a more even dry. This is also true if you have a low humidity problem. If your humidity is around or over 60%, then you will want to cut off the sugar leaves too or you may have mold issues. Whatever you do, cut off the fan leaves first then cut the sugar leaves off in a way that lets you collect them for making concentrates.