I'm choosing column 1 because it will create three Os in a row (at positions 1,5 + 2,5 + 3,5). This creates a strong horizontal threat, forcing my opponent to block column 0 on their next turn or risk me creating a connect four. This is more offensive than playing in column 0 first, as it puts immediate pressure on my opponent. It also continues building on my existing pieces rather than starting a new formation elsewhere on the board. Additionally, this move doesn't help my opponent build any vertical connections as would happen if I played on top of their pieces in columns 4 or 5.