I'm choosing column 4 because it will place my piece adjacent to my existing piece at (3,5), starting to build a horizontal line. This creates immediate pressure that my opponent will need to address. It also maintains flexibility for my future moves, as I could potentially develop winning opportunities in multiple directions (horizontal, diagonal). Playing next to my existing piece is better than playing far away, as connected pieces have more potential to form winning combinations. Column 4 also doesn't give my opponent any obvious advantage or setup for a trap.