Well if you mean the ability to use GA once every 5 mins vs Zhonya’s every 2mins . And then , zhonyas can actually be used to bait out an important spell from the enemy . GA is literally die and hope you don’t get collapsed on by enemy team.
LE vs SS - LE actually gives straight ap . Not many champs who build shiv stack attack speed . They are champs with low wave clear . And shiv requires you to add more crit which is “chance damage” to be really effective . LE is guaranteed damage since all you have to so is buy any ap item and you get stronger .
LE is built by most ap carry’s because it’s literally the best ap item and provides ap,mana,cdr and the aoe proc scales off your ap as well.
LE is far better than shiv for wave clearing . Also it procs via any instance of ap damage , so certain AA/passives can utilize it .