If the world was an honest place an 850 annular would flow 850 and a 900 downleg would flow 900....
If your comparing boosters it really depends on what your combination likes. The annular tends to come on sooner in a given application, comes on "solid" once it is flowing, and get weird at a lower airflow velocity level than a downleg.
The downleg comes on a little later, starts out a little fuzzy/drippy/blobby (those are technical terms), but seems to go further on velocity before it gets funky.
Airflow velocity is a function of engine size, RPM, and overall air flow area through the venturii. Your comparison assumes that this is fixed and nonvariable. Either booster can be made to work, and in race engine that see modest RPM band ranges the difference may be very small. A wider RPM band application (street car, Engine Masters) would probably favor the annular.
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