BB/100 hands is a waste of space. It's results oriented and that's not what you're looking for with an HUD. You want to find out how your opponenet responds to certain situations. It's also worthless unless you have 10-20K+ hands on them.

It's better to notice whether your opponent is +$ or -$ during a given session. Reason being is their behaviour may change accordingly. Example: Opponent tightens up alot after adding lots of chips to his stack, but becomes reckless and spewy when he is in the red in attempt to gain back what he has lost. Of course noticing things like this is probably better suited for live play since everyone multitables these days and won't notice this too much.

Better stats to include in your HUD would be the basically the rest of the ones mentioned to you in this thread.