-- Last Updated: Jan-09-13 12:53 PM EST --
...are very different boats, regardless of their common lineage. I've owned both for several years, as has my girlfriend and her housemate (3 of each, total). I've also paddled the old-style Pintail hull (which I prefer) and the post-'95 version, which is squarer in the bilges and higher volume overall.
The tracking on the Pintail is not just loose; with the skeg up, the bow really tends to hunt around and it does not like going straight. I find its behavior to be considerably different from other loose tracking boats I've paddled.
The Anas Acuta tracks considerably better than the Pintail and doesn't require significant effort to keep it going in a straight line. It's not as maneuverable as the Pintail and although the hull speed isn't much higher, it approaches its limit more gradually; there's no "wall" per se.
Unless you've paddled a boat, you really shouldn't try to predict the subtleties of it's handling.