http://forallmyfriends.com/2011/09/2...-vs-histogram/

http://www.cyclesmercier.com/geometry_tt.html

http://www.urbanvelo.org/issue3/urbanvelo3_p44-45.html

The differences between what gets marketed as a "track bike" but is actually a fixed road bike and a road bike are pretty small.

Generally 74st/75ht is preferred for fixed street riding because you can't sling the bike into turns like a freewheeled bike, you have a lot more steering input through the pedals that makes a fixed gear with less aggressive geometry feel sluggish.

At the geometries we're talking about fitment, personal fitness and tire choice will have a much larger effect on comfort.