Rewinding to doubleofive's comparison between the Daleks and the Cybermen it was a big mistake having the Dalek Emperor as THE Dalek Emperor in Parting Of The Ways.

Essentially you have a Cyberman story there.

Davros would have turned humans into pseudo-Daleks (he did it before rather gruesomely in Revelation Of The Daleks).

The lone Dalek from Dalek might have turned himself into a new Dalek Emperor and done it (making a new race like himself, Dalek with a hint of human).

But they would have picked the winners of the games not the losers.

The true Dalek Emperor would not have contaminated himself with all these disgusting human-Daleks unless it was just a means to get humans to kill each other.

One pure Dalek can clone all the pure Dalek mutants it needs from itself.

Racial purity is their prime concern.

The Cybermen would turn anyone they could into a Cyberman and things that they can't they would turn into Cybermats or Cybercontrollers.

Put that down to another RTD narrative screw up.

Cybermen (in theory) are totally emotionless and logical where as Daleks are ruthless and full of 'hatred of the other'.

There is another related species of cyborg (which I shan't spoil with details here) who are basically insane children who kill for fun.

Riffs on the same physical idea but differing because of their central philosophy.