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Best = none IMO. Unless you're asking about looks?
And you only have about 7 turns on standard bolts on the front wheels, which isn't a lot, so any amount of spacer really needs longer bolts to be safe. Standard bolts are 60deg tapered M12 x 1.5 x 24mm long thread, some say 26mm but mine measure 24mm (don't know why????).
For me I'd stay standard, unless track car. Reason being I don't want to sacrifice steering feel. But I've not tried big spacers so cant really say what effect they have on performance.