Nurgle, 'cause the rest just wanna backstab/rape/plain ol' stab you in the face... with an axe..... made of skulls.... and blood. But no Papa Nurgle, Papa Nurgle loves you with an unending life of disease and pain.... okay they all kinda suck, but at least Nurgle loves you.... well so does Slannesh but in a different don't touch me there or you didn't tell me the safe word kinda way.
the worst is that you're right, nurgle is the time where Slaanesh is immediately ... Fate can only corrupt ... maybe ....
The thing is only 4 options can be put on a poll, and so the four major Gods of Chaos were put up. Although Malal is a mighty chaos god he isn't as famous as the four others.
4 and at any time there are only Khorne and Slaanesh, for immediate enjoyment. Nurgle and Tzeentch and long term. Malal, I do not even know who knows, or who he is.
All that is alive will someday die and feed the predilect sons of Nurgle: the maggots ...or if you are an Inmortal Daemon Primarch, you might get pounded by Lord Kaldor Norris Draigo every century