1 or 2 algorithms

Hi,

I'm making an algorithm to classify tweets to be positive or negative. I also want to know if a tweet is objective, because a lot of tweets are. Is it better to make one classifier with classes: positive, negative and objective. Or is it better te make 2 classifiers with first a classifier with objective and subjective (positive or negative) class and then another classifier with de classes positive and negative.

Thnx