Why do pros always go sundered> cleaver on AD fighter jgs instead of going eclipse> sundered?

I've wondered this for quite a while, in soloq I'd see my J4's & xin's building eclipse>sundered but in pro I never see AD fighter jgs building eclipse. They (j4 & xin) always go for the sundered>cleaver core, I've even seen Vi go for that core and I assumed she'd like triforce rush given that she has 2 auto resets. The only exception that I can think off from the top of my head is wukong who goes triforce>sundered. Are pros valuing having more 400 more HP instead of having more 20 more AD since they teamfight more often?

Edit: Xin W now insta stack cleaver in melee range after his ASU