Why Even Pick a Tank Over a Juggernaut?
For the crowd control? Juggernauts have that For the sustain? Juggernauts have that For the peel? Juggernauts have that
Juggernauts also have massive damage AND they happen to counter tanks.
The only thing tanks do better than juggernauts is engage enemies for team fights, assuming the tank's allies didn't feed AND that the tank wasn't totally stomped in lane. Because, if they were, the team won't have much in the way of a reliable front line.
Juggernauts also benefit from building damage items before tank items. Tanks don't scale well off damage items. Juggernauts also scale better into the late game whereas tanks are shredded by hyper carries if the game runs too long.
So, again, I ask why. Why should anyone besides the support consider picking a tank over a juggernaut in the current meta?