Mr. Blake's article on distance lines:
The first style is the distance anhyzer, which dominated distance technique from the first official 600' throw performed in 1987 and held the distance record up until 1998. This distance anhyzer is thrown with overstable discs and the general consensus is that the strength of this technique is that it yields very good consistently long distance.
The second style is the hyzer-flip, which has been the preferred method of distance technique since 1998 and been used to set every distance record since then. The hyzer-flip distance technique is generally thrown with stable to understable discs and starting the disc on a hyzer angle, letting it rise, flatten, and turn over. The consensus on the hyzer-flip technique is that current distance drivers are better suited to this method of throwing (since they are much less overstable than earlier sharp-nosed drivers) and that when executed perfectly, yields greater distance potential than the distance anhyzer but is less consistent in its execution.
I think there are less variables in throwing an anhyzer than a turnover. A turnover has to get up to flat and over to anhyzer. That's a lot of movement, and lot of variables to go wrong. Anhyzer always starts out anhyzer, and, when thrown with something overstable, always comes back. Much fewer variables = much more consistent. However, as most people agree around here, you generate much more power from a hyzer body position. So hyzer flip = more power potential = more distance potential.