For the short term, whichever doesn't knock/ping in your engine and is cheapest.
For the long term (decades?), I have tossed quite a few carburetor bodies from the 1930's, 1940's, and 1950's because of alcohol in the fuels. If one looks at the floor of the bowl on these units, one finds pits. After a long enough time, the pits become holes.
Jon
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"Good carburetion is fuelish hot air". 
"The most expensive carburetor is the wrong one given to you by your neighbor".
If you truly believe that "one size fits all" try walking a mile in your spouse's shoes!
Owner of The Carburetor Shop, LLC (of Missouri).
Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings.
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