I agree with WPR but have a nit pick
The answer really is whichever one requires the least number of cuts.
And from my thinking, using a board of the same dimension for both,
it would depend on which side is longer, the end or edge.
IE: 8" x 10" board
You lose the width of the blade for every cut you make.
(Eight cuts could equal one inch of wood)
* Cut the pieces 8" long you make 9 cuts. 9 cuts x 8" = 72" in cutting.
* Cut the pieces 10" long you make 7 cuts. 7 cuts x 10" = 70" in cutting
Less cutting = more wood.