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Downleg boosters have a slight Z shaped bend in the mounting arm, so they sit a little lower in the carb and get a stronger vacuum signal. Annular boosters have discharge holes arrainged in a circle, instead of just one discharge hole. Either are considered to give a stronger vacuum signal than the regular straight-leg boosters.
vacuum signal strength:
straight < downleg < annular
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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