I have three bikes I regularly commute on. One has platforms, one has SPD mountain bike clipless pedals, and one has dual purpose - SPD on one side and platform (quill type) on the other side. I have no preference on commutes up to 10 miles. The longer my commute, the more I lean to clipless. Mostly it depends on what shoes I need to be wearing when I get where I am going OR what bike is the easiest to grab when in a rush.

Chocolate or Vanilla ice cream. Sign me up for either! Ride what makes you feel the most comfortable. If money is an issue, stick with platforms and use almost any shoes you currently own.