[deekayen]

The metric I lean on the most is the one published by Andong at http://www.andong.co.uk/dvorak/Default.aspx. I guess that's odd since I spent the least amount of time talking about it and put it at the bottom of the page. It is focused on metrics of efficiency and effort. If you wanted speed, you might want to look at things like finger distance and home row usage more closely, in which case Arensito or Colemak might have an edge.