where colder in the north or the south pole?

Very funny, Sheppard!

North is in the sea, keeping the temperature more stable.

See copypasta from the other wiki:
The North Pole is significantly warmer than the South Pole because it lies at sea level in the middle of an ocean (which acts as a reservoir of heat), rather than at altitude in a continental land mass.

There are penguins in South Africa, South America and Australia. I don't think they are colder than the North Pole.

What Kitty said is dead right.

The ocean/water around and under the North Pole keeps it warmer than the South Pole, which is a large continent surrounded and covered with ice rather than just a floating ice block.

That said though, I think more people live inside the Arctic Circle than the Antarctic Circle, simply due to the geography of the Earth.

Coldest recorded temperature is from the Russian owned Vostok Research Station on the South Pole.

As to your penguin comment, there is polar bears in the Arctic (North)...

schenkelklopfer ;)