When I side with vinyl siding I like to use a set pattern opposed to using what is left at the end of a run to start the next row. I start with a full piece (12’6″) for the first row, second row is a half piece (6’3″), third is three quarter piece (9′ 4 1/4″) and finish with a quarter piece (3′ 1 1/2″) before I start this pattern again. This pattern keeps the joints three feet plus away from each other and three rows of siding before a vertical joint is duplicated.
On some walls the first piece may be subsututed with one of the others so that a full piece is not needed when you reach the rake set back.
I have seen siding jobs stair stepped which I don’t care for. Down and back where joints are one row apart all the way up a wall. And the what is handy method of that’ll work.
In my opinion, I’m more interested in what we are putting on the wall rather than what is going in the dump truck.