Depends on my mood and the time of day. Usually I prefer something more sativa dominant since I rarely have time to devote soley to being stoned. If I can get nice and high and still do what I need to do I'm pretty happy. If its nightime though and I just want to kick back on the couch and get really baked a nice indica is always good.
Also, every now and then I get these spasms in my back that are really painful. When that happens a good indica is much more beneficial than a sativa.