I typically use a fixed amount of pencil lead on a dropper line off of a three way swivel, by crimping the lead on it can pull free when snagged. I use this set up for most of my drift fishing. However, when drifting slower deeper water I go to a sliding weight so that I can feel the takes sooner. I don't think that this is necisary in faster water unless you're missing fish. I'm no expert, but this has worked for me.