How would it go if all the Eternals together (but as individuals) attacked the SI? They would probably give him a hard time. The Uni-Mind is supposed to be more powerful than the sum of its parts isn't it?
In a straight battle between the two (no support for SI from the forces of the Kree Empire) I'm tending towards Uni-Mind.
Oops. You may be right then, since SI would have access to all the knowledge collected by the Kree Empire.
Although maybe that would just make him more book-smart. It's possible that since the Eternals are more evolved than the Kree, they would actually produce the more intelligent combination.
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The Kree created the Inhumans, who are pretty far advanced themselves. And The Supreme Intelligence has evolved every Kree on the entire planet of Hala before. Along with being able to unlock the Destiny Force within Rick Jones and knowing exactly what it is and what it does.
Supreme intelligence is more intelligent than Uni-mind because it has the collective intelligence of the greatest Kree minds such has thinkers, generals, philosophers, scientists, engineers, military geniuses, mathician and so on. Despite the fact that Uni-mind has the collective intelligence of the Eternals there is evidenced that Uni-mind has the composed brains of the greatest Eternals mind.