annular vs downleg

In general, annular usually provides a slightly higher boost signal and also smaller droplets. Downlegs also have a slightly higher booster signal, but take more velocity to get started.
Annulars come in different sizes with different numbers of holes so those two factors alter the results as well.

Although we all like to think that smaller droplet is always good, in some situations its not. Depends on how hot the intake gets, how good the fuel distribution is, how well the fuel gasifies in the combustion chamber and this can vary with rpm and load.

It's possible a specific booster works better with a specific intake, but its hard to rule out other possible reasons unless its same carb where someone then changed the boosters.