Depends on situation. How deep I'm fishing and if around structure. Wind, etc. I personally think people make too much about it in regards if the FISH actually care. I don't think they do that much. I used to use 1/2 ounce fishing deep around timber at Sardis. Just look at the size shad those dudes eat. During the spawn fishing 1-3 feet, it kind of goes both ways. Don't need a heavy jig to get deeper but then again sometimes a heavier jig gets it down thru the vines and stuff. If fishing around cypress tries w/o vines, etc. again, lighter works for me. And sometimes during hot summer around those dead timber, it helps to use something really light to float down like fly jigs but that only works w/o wind in my opinion.