Nande Nanda-san > Otr > Red Hood. That said, while Otr is much better structured than Red Hood, it does fall into being a much more bland piece of work. The concept is more interesting than the execution. It opens with the power of flames in a world which suffers from neverwinter, how not everybody needs to be a warrior, and how Otr can keep the army strong from the kitchen. If it went in that direction, while I don't think it'd fly in Shonen Jump, it'd probably be a more personal and intriguing story. It is easy to write a story where you mustgather power and kill the enemy, while ones where killing isn't in the picture need much more creativity to move and work. My ideal Otr probably isn't a Shonen Jump series and isn't a battle shonen.

What Kawaguchi Yuuki seems to be weak at is starting a story, while he is very good at ending them. Both Red Hood and Otr were more interesting at the finale, in spite of their axing, than at the start. Secondly, he has become very good at writing the villains. The male cast isn't memorable, the women are big and muscular and that's very good, but it doesn't keep the series afloat. Doadoa is the best character in all of his series, while Colerio and Fimbul also were interesting. Suruld is a much more common archetype, so while not a stand-out, still another one in the count for villains that felt better to read than the heroes.

Perhaps Sensei should try veering towards Dark Fantasy, and have the main characters be the questionably evil guys that you can cheer for. The courage, determination and friendship battle shonen formula might not be for him. (I also believe in his comedy, though I don't know how he'd handle a comedy serialization.)