Here are a few things to consider when choosing a jig to fish with.
Standard round heads work for almost every situation. These jigs are well balanced, and hang horizontally when tied to the line, resembling a swimming minnow. They also get into the strike zone quickly, which is preferable most of the time.
Bullet heads are hard to beat in strong currents. They have the most hydrodynamic shape, which allows them to slip through current and stay close to the bottom better than any other type of jig head.
Slider head jigs are the best choice for swimming over weed tops or any shallow-water obstructions. These jigs sink very slowly and have an added gliding action. Some have an upturned nose for even more lift.
Fishing in weeds with most jigs can be frustrating because the protruding hook eye catches bits of vegetation. A tapered head with the hook eye at the front spreads and slips through the weeds, creating a path for the hook. These models also come with a variety of weedguards that range from heavy wire to light plastic to match different conditions.
The bottom of these jigs is flat so the can hook angles upward when the head rests on the bottom, giving the fish a better look at your bait. Make sure a stand-up jig does what it actually claims, if it doesn't stand up when you toss it on a table, it doesn't do its job correctly.
These jigs are meant fit inside plastic tubes. Insert the head into the tube and the line tie pokes through the plastic. This secures the plastic to the head, and also conceals the jig head for a more natural-looking presentation.
The built-in propeller produces extra vibration and flash, and also makes the jig fall more slowly, which is beneficial when walleyes are less active and need more time to strike.
Some jigs are equipped with surprisingly small hooks. Make sure the hook has a large enough gap so the point sticks well out of the bait. If the gap is too narrow, the point won't be able to penetrate a walleye's jaw.