You have to follow the urinal codes...you NEVER take the urinal next to someone else, unless it's an absolute emergency (this is forgiveable...the person next to you can usually tell by the sound). Also, if there's only 3 urinals, never take the middle one. You then have control over the whole line.
Stalls aren't that big of a deal; I usually go for whichever has a door that actually locks.
And to answer your question, I usually go to the farthest one...don't know why.
Just remember not to ever break the vertical or horizontal plane while at a urinal
