At first glance it looks like these are two very evenly matched teams. But a closer look reveals that Team JLA has two members with an ability that Team Avengers has no answer for (especially with it's mages being occupied by Team JLA's mages).
Team JLA, they work for it but they get the majority.
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..even the outer hells are indifferent matters for they bow only to potent and archaic Nodens.
Nova flew 80,000 light years in five weeks, and the narrative directly states that the Worldmind regulates and amps his reflexes to match the speed so he can navigate space and avoid collisions (and slows them down when he doesn't need them so the trip doesn't take an eternity from his perspective). Dude is fast.
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Normally, but in this case his reflexes are directly stated to be on par with his flight speed.
JLA wins though. Avengers reserves are over all more powerful, but the main line up JLA has a not insubstantial power advantage and Thor and Quasar can't make up for all the weak links.
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I thought the Marvel reserves being more powerful was a conscious decision on your part to remedy the power imbalance on the main teams... but apparently not
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Actually he was navigating at hyperspeed which means he was operating in hyperspace. That's how GLs navigate in space, doesn't mean they have similar reflexes. Also nova directly states in the comic that his mind couldn't catch what worldmind was feeding in his mind.
Also, if I recall correctly, time is weird when in hyperspace - it could have been five weeks, it could have been five minutes....
So reaction times are meaningless. Not that it wasn't an impressive feat, mind you - just that I don't think we will be able to use 'time' as we know it to measure his feat.
If by "Kent", you mean Kent Nelson, then he can solo. If you mean Kent V. Nelson, then the JLA still wins IMO. there's one weak link on the JLA, and 5 on the Avengers.
I'm not sure what your rational behind the first part of this post is. Hyperspace is a pseudo scientific term created for science fiction that attempts to rationalize greater than light speeds by up shifting the person / space ship / whatever into a theoretical new dimension. Anytime something hits greater than light speed travel, they are in hyperspace.
It stated that his mind couldn't catch up to his brain (or vice versa)... whatever that means. Nova missed the deceleration by a split second, which when traveling at thousands of times greater than the speed of light is a massive margin of era, and then he had trouble compensated and adjusting because he was extremely disoriented for some reason.
The rest of the book, that wasn't included in the scans, explains why that comment was made and just what it means exactly in the context of the story. The Worldmind regulates Nova's reaction time and perception, so that when he doesn't need to react to anything, his mind slows down. The reasoning being that even if a person could move at speeds greater than light, if they also perceived the world around them at the same speed - which they would need to in order to navigate - that relative to their own perspective it would take them just as long as anyone else to get anywhere or get anything done. How long would it talk you or I to walk to China? Realistically... it should take Flash the same amount of time relative to his perception of reality. That would be enough to drive a person insane... now imagine the same thing except the distance is 80,000 light years. Time isn't weird in hyperspace, the Worldmind simply speeds up and slows down Nova's mind, so that he only has the reactions when he needs them and doesn't have to spend an eternity flying through space in his own mind.