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Stitch Welding - Staggered vs. Directly Opposite

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Fellow engineers,
 
        I have a crane runway situation for which I would like some opinions.
 
        I have a W18x45 runway beam with a C12x20.7 cap channel topped by a 1.5x1.5 square bar for the crane rail.  The specified welding is 0.25"; 3"welds @ 12" spacing.  The question is "Should the opposite side welds be staggered or directly opposite one another?"
 
Regards,
 
H. Daryl Richardson