Agree with left side for seeing more of the island prior to landing. Sitting on the right side, you see almost nothing of the island until just before you land, so if that is important, left side is the better choice. However, we always choose to sit on the right side.

Since our flight leaves Toronto around 9 AM, for most of the flight the sun is on the left side, so you often need to put down the window shade. Our flight home leaves around 4 PM, so we also sit on the right side for the same reason. It also allows for wonderful views of Simpson Bay and Pelican Key on our way out.