I always use a Russian join or just weave in the ends so I don't end up with a knot anywhere, so I stop at an edge if I can but it doesn't matter if its a right side row or a wrong side row. Even if you tied a knot you ought to be able to fiddle with it until its on the back.
I know it does matter if you are changing colors while knitting certain designs. But if you are using the same color it doesn't really.
recent FOs: Shedir cap, Bricks of Atlantis, Pirates Hat, Citrine Socklets, Teddy bears, 1 entrelac sock
OTN: scraps blanket, Shedir for Teenie, Ice Serpent Hat
NIL: Qiviuk tam re-visited; weatherproof gloves; sweaters
My knitting blog: http://emilai333.wordpress.com/