Sung Jin - woo in Solo Leveling has the ability to level up, which significantly increases his stats and powers. He can also summon shadow soldiers, which is a very unique and powerful ability. As for Goto from the novel, since we don't know which novel he is from specifically, we can't really compare directly. But if Goto doesn't have the ability to create minions or rapidly increase his power like Sung Jin - woo, that would be a major difference.
Well, in many of these fanfictions, the theme of mutual respect between Sung Jin Woo and Woo Jin Chul is quite prominent. They respect each other's abilities and decisions. Adventure is also a common theme, as they embark on various quests or missions together. There's also the theme of growth, both as individuals and in their relationship with each other. For example, they might learn from each other's strengths and weaknesses during their adventures.
You can start by looking on fanfiction platforms like Archive of Our Own (AO3). It has a large collection of fanfics from various fandoms, including those related to Sung Jin Woo and Woo Jin Chul. Another option is Fanfiction.net, though the tagging system might be a bit different. Additionally, some dedicated fandom forums or groups on social media platforms might also have members sharing their own fanfictions or links to good ones.
Well, Sung Jin - woo from Solo Leveling has some remarkable abilities. His shadow soldiers give him an edge in combat as he can use them for various strategies. They can act as decoys, attackers, or defenders. On the other hand, we don't know much about Goto from the novel. If Goto is a normal human - like character without any extraordinary powers, then Sung Jin - woo would definitely win. But if Goto has some unique powers like mind control or teleportation, the fight could be more evenly matched. However, considering Sung Jin - woo's experience and growth throughout Solo Leveling, he still has a good chance of coming out on top.