Is Putin more dangerous than Isis?

At the moment, all eyes are on Isis and the radical Islamist group is eclipsing Putin's evil. So my question of the day is, should the world be more concerned from Putin than from that amorphous group of crazy Muslims?

I'd say the former is spookier because he's on his own as an absolute modern Czar, he is a patented egomaniac and, worst of all, the man controls almost 10,000 nuclear warheads at his fingertips. I don't know for you, but for me, it's both a frightening and convincing argument!