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Weight per size. Come into their own when the bite calls for being fairly deep, quickly getting back down there with a small presentation
I think they are more of an alternative to lead since lead can be damaging to the ecosystem. Also some places have a ban on lead, so you must use something else.
Tungsten is the way to go but only if you want to spend twice as much money for a jig. It definitely increases the sensitivity of the fishing rod due to the weight while keeping a small presentation at the hook, also it increases the time spent fishing since you can get the bait into the target zone (depth) much faster.
Best answer!!! When the bite is hot you need your bait in the zone faster when dropping down...tungsten allows you to do that!!! I use 4mm Fiskas and if they are fussy I will tie on a 3mm...but that is rare!! Oh and if you are going to get some go with Epoxy Glow...paint is better and at almost $3 a pop getting glow gives you more flexibility!!!