3/8's is the best "all around" size, and if you only have one, that's the size I would pick. I use three sizes....1/4oz for super shallow work,from the bank out to 3'-5' FOW, 3/8's oz. for mid-depth (4'-8' FOW), and 1/2 oz for deeper weed line stuff in 8'-12' FOW. I K.I.S.S. for colors....bluegill for clear water, black/blue for dirty water, and white for when white is what they want. I also K.I.S.S. for trailers. I have tried many, but I always come back to one, and this one type is by far the most productive in every condition I use it in............the old, plain jane, nothing exciting to see here......... 4" single tail grub. Green pumpkin (sometimes with the tail dyed charteruse) on the bluegill, black on the black and blue, and white on the white. Rig the grub with the tail "curled" down if you want a little "lift" on the jig, or with the tail curled "up" if you want to keep it running low. I don't do anything fancy on the retrieve. Cast it out, let it hit the bottom, and start cranking at a moderate pace. Sometimes I will kill it and let it sink next to juicy spot if I have already ran it through there without a bite to see if that triggers a fish that may be lurking, but not chasing.