Special A, Himitsu no Ai-chan Recommendations
Both of the female main characters view the male main characters as their ultimate rival. Because both female main characters are too stubborn to notice the male main characters' feelings, the male main characters propose date resulting challenges which both the female main characters accept.
I wouldn't say that both manga have the same feeling, but they both have two rivals falling for each other. Special A has a lot of characters and we get to see their stories too. Overall, I liked Special A more than Himitsu no ai-chan.
They're both about the rivalry between a guy and a girl in the same school. Both female characters are stubborn and strong-willed.