I need to do surprisingly litter lowering of material, but it's mostly fir limbs 6" or less, so I use a sling to choke the limb that has a biner on it to connect to a loop in the rope. A very solid, tight connection, no knots required. Once I get into lowering trunk wood, I switch to knots, but I agree having a biner on the end of the line, plus a half-hitch is also fine in most situations.
I have had the same steel DMM biner on the end of my chipper winch line for choking logs and brush and dragging it through the dirt for like 3 years. That thing has been through hell and still works perfectly.