Cassie is stronger.

June: The minute Cassie sees us together … she’ll pull you back in. You’ll try to resist, but she’ll wear you down because Cassie always wins, while I’ll be left in her shadow. No career, no future … no you. No way!
Nabil: You have seen I am strong.
June: Cassie is stronger.
[June leans close and touches Nabil’s arm]
June: If you care about me, dig deep tonight and dance hard. Help me show Ramon I can deliver.