Stare At The Sun

If, at the height of both their powers, the Spartans and the Vikings were to meet on a battle field, on even terms (same number of troops, and an open, no terrain advantage battlefield) Who would prove the victor?

Though there is a significant time gap, please, analize this in the best way you can. I believe that because the Vikings were nothing more than a simple band of barbarians, they would loose, horribly, against the amazingly well disciplined ranks of the spartan army. Who had better training, better tactics, better education(as all spartans were very well trained in all aspects of war, from a very young age). I don't think the Vikings, despite their ferocity in battle, could overcome such a miltary force of equal numbers.

Case an point, the battle of Thermopylae, where King Xerxes best fighters, his Immortals, could not break the lines of the Spartans. They are similar in their fighting styles, in the light armor they were equiped with, and their valor in battle.

The advantages that the Vikings would have, is that of the reach of their weapons, compared to the Short swords of the Spartans(However, this, as I believe, would be countered by the spears, of the rank behind them).

A point was also brought up of the viking "bezerkers" i believe that despite their ferocity and bravery in battle, they would fall very quickly to the spartans, as they fought naked, and would quickly be hacked down.

So, who would win this, the battle of the Spartans Vs The Vikings?
(and justify your answer, regardless of the side)

Thanks!