Shawn, you will need 18 foot long boards to span the diagonal, no matter which way you put them in. The use of long lengths seems pretty wasteful of lumber and money to me but it is your deck. The alternative is to butt the ends over a joist and those joints can get splintery quickly. If you do go with the diagonal pattern, I think that the 45 degree approach looks better but that might also be a matter of taste.
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