Horizontal VS Vertical

[alwaysotherfish]

I am in the process of builing a chicken coop. I am going to be putting old wood on the outside to form a siding look. Is there a huge difference in whether or not the siding is vertical or horizontal. The coop will be enclosed inside of a run in about 2 more weeks, to keep it from direct elements. The wood siding will be going around this:




Thank you in advance.