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Webers are easy to tune. I have never tried to do a SPICA setup but the extra complexity makes me believe that it may be harder. Webers may be the only reasonable choice if you have big cams. I average 23-24 mpg from my Spider with Webers and Richard Jemisons 12.3 intake and 11.5 exhaust cams. Even if you have mild cams now, Webers will make it easier for you to go for more power in the future. SPICA is pretty much an open loop system - the fuel delivery is not influenced by the air velocity. Carbs have a degree of automatic compensation for engine changes because increased gas flow creates a greater pressure depression in the venturi and that produces more fuel flow.
 
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