If you're comparing Starboard and the new Fanatic Falcons, the better Starboard to compare with would likely be the All Star instead of the Ace. Both the All Star (2013 model) and the Fanatics are hybrid race/downwind boards designed to be fast in a wide variety of conditions. I'm know the All Star 14'x25" well and it's a great all round board. It goes upwind well, handles side wind well, downwinds pretty well but not quite as smoothly as I'd like. It's also pretty fast in flat water - here's a link to a flatwater speed test we organized that included the All Star, Ace, JP Race, and 3 Barks:
supdownwind.blogspot.com/ The 14x25 All Star came out on top (or pretty much tied with the 14x25 Ace - we had a heavier tester that was faster on the more stable All Star so that tipped the final result in favour of the All Star).
The one area where I'd like to see the All Star do a little better is in downwind conditions. From early reports, it looks like that's where the Fanatic excels. If anyone has some more comparisons between the 14x25 All Star and the 14x24.75 Fanatic, let us know. That's in addition to the great comparison posted by Kieranr.