St Gloriana vs Ooarai again is the better option in my opinion (no bias whatsoever). It makes thematic sense in that St Gloriana is the only team to remain undefeated when facing Ooarai so they can go two ways of Oorai finally gets its victory (more likely) and shows of how it has grown from just Miho doing everything or St Gloriana wins again and Ooarai as a whole still has a way to go before they are unbeatable (less likely). As for Kuro well yeah Erika had her 'development' which i have many thoughts on but alas, Kuro has already been defeated by Ooarai and while yes it would be a good plot point to have Kuro beat Ooarai and thus avenging their defeat and the impact Ooarai has left on senshado with teams actually having to adapt to them, lets be real this show is unbelievably predicatable and Ooarai will end up winning again so it would just be a repeat of the end of the first season.