It doesn't make a difference to me...
I usually start with #1 & #2 and work my way back... You put the crank journal up when the block is upside down and shoot both pistons that go on that journal, then the next journal, etc... You install opposite pistons together while you have the crank journal at BDC and can access both rods to tighten the bolts....
Always go back and double check torque on mains and rods before you put the oil pan on just to make sure they are all tight...
Measure twice and the engine won't blow up....