Looking at the pattern of the opponent's choices, I notice they've played rock 4 times, paper 2 times, and scissors 2 times. They seem to favor rock as their most common choice. In the last two rounds, they've played scissors twice in a row, possibly developing a pattern. If they continue with scissors, rock would be my best move. 

Additionally, I'm currently leading 3-2, so playing defensively makes sense. Rock is a strong defensive choice as it can at worst tie against rock or lose to paper, but beats scissors, which my opponent has been playing recently. Given the opponent's preference for rock and recent scissors plays, choosing rock gives me a good chance to either win this round or at least tie, maintaining my lead in the overall game.