juubi jink practically is the same thing as the juubi just concentrated + has the cognitive ability of the shinobi using its power.
-Thats true for all shown forms except for the shinju. -The only thing the juubi has over its jinkuriki is size, which in most cases is actually a negative, however depending on the situation the massive figure of the juubi may be beneficial. - furthermore, second form juubi is able to near instantly create bijudama that are at minimal town level + can travel thousands of kilometers. Sure, jink has more DC way more- but juubi has the benefit of having feats of fireing smaller scale bijudama faster than obito ever did.
-I would wager that the shinju has more threatning feats than a juubi jink ( atleast in the context of the narutoverse)
-First, lets look at its size. - its width is significantly bigger than a island and its length goes significantly higher than the cloudline. Furthermore, its most dangerous ability is to absorb chakra.What I don't think people realize is that, first, most of the shinju's chakra was inside obito- not the tree when we saw it( after obito summoned the shinju, he was still in his juubi mode ). The shinju with all its chakra is probably massively bigger than it already is.
-Second, we saw panels of Hiruzen, Sasuke, Naruto, etc.. cutting branches quite easily, however- considering how big the shinju is cutting its branches is equivelent to crushing a grain of sand on a beach.
In my opinion the shinju is severly underated on the base-sure it hasnot fired country busting bijudama ( imagine if it bloomed flowers like obito's smaller tree- it could fits 100's of juubi sized bijudama) - but it has arguably one of the most hax abilties in the verse- chakra absorption.
-So, in regards to your idea that juubi jink > juubi in all aspects isnot always true- atleast in my opinion. I can imagine several scenarious in which the juubi's immense size would be usefull, the juubi's ability to create a army of clones aswell.- If we take the idea that chakra=reistu=ki, then for the purpose of multiverse battles- the shinju could arguably be the strongest being in the narutoverse if given cognizence ( not being controlled/subdued)