If you had to live on a planet other then earth which one would it be and why?

[SvennoJ]

If we're talking about fictional planets then Helliconia sounds like an interesting place to live.
Two suns in the sky sounds good to me. I wouldn't want to be there during the great winter though.

"Helliconia lies in a loose binary star system, which consists of a yellow-orange dwarf similar to our sun, Batalix (spectral class G4 [1] ), and a hotter and brighter white star, Freyr (Type A supergiant). Helliconia orbits Batalix, which in turn orbits Freyr. The Batalix-Freyr system is supposedly in the constellation of Ophiuchus, about a thousand light years from Earth.
Helliconia orbits Batalix in 480 days. Each day comprises 25 hours each of 40 minutes which in turn are each 100 seconds long. This is called the "small year". Helliconia and Batalix's orbit around Freyr, the "great year", is highly elliptical and takes approximately 1,825 small years which equates to some 2,592 Earth years."

Great series by Brian Aldiss, I can highly recommend it.