Showing BBs makes playing easier as you directly see stack depths without any calculations. when it was introduced in pokerstars i used it for a while but finally resorted back to showing real stacks to train my brain better for live games.
I prefer to see my chip count. There are times however, when working with the smaller numbers associated with the BB view makes calculations quicker and easier. In these situations I will switch to the BB view. But for the most part, I prefer to look at my chip count.