The Scenario
Greater Sci-Fi combatant
Normal arrows, bomb arrows, and...?
Twilight Princess Link does not have any magic arrows. He does, however, have the Magic Armor now, which leads to think he wins.
Eragon, barring magic, is not particularly superhuman. He can enhance himself, and was turned into some Elf equivalent at some point. Link is very far beyond human in several aspects, including strength and durability, so he has the physical edge.
Master Sword vs. Brisingr, which, if I recall right, is a flaming sword. The Master Sword protects from and dispels magical effects, so I'm just going to say it has the edge there.
Magical versatility goes to Eragon, but Link has a lot in the way of protection. The Triforce of Courage is seen to mitigate magical and transformation effects, and the Master Sword does the same with the added bonus of dispelling curses and cutting through magical defenses. Then there's the magic armor, which protects Link from all damage as long as there is money in his pockets. Kind of like a Ward, except powered by Rupees. Who even knows how canon that is, though.