I notice a lot of the guys here use a Surgeons Loop for their loop knots.
I have always preferred a Lefty Kreh loop knot since the tag points at the fly/lure rather than fwd like a Surgeons or Rapala Loop, it catches less weeds / grass. When I am fishing clean water I use a perfection loop (not quite as strong) since it is a straighter pull and the fly tracks better through the water, on the perfection loop the tag points out the side so it's not quite as great in grass/weeds as the Lefty.
Any opinions from you guys on your preferred loop knots and why for pulling jigs for Crappie?