Probably going to get about the same answer from others...I think it really all depends on the conditions.

Pool swims - practically perfect conditions VS. Open water - could change at any moment

Leading up to the M.I.M. Olympic Triathlon this year I was pool swimming 1650 yds in avg. of 27-28 minutes. Come race day the wind was strong and the water was choppy yet my swim time was 26:16 (w/wetsuit).

So I wouldn't worry to much about compairing one to the other but rather building good technique.

Fred