Leo says he's not really a fan of how much "trialware" they put on their computers. Also, HP can't make up their minds whether they want to be in the PC business or not, and that's not really a confidence builder.
However, the real reason is that in general, HP hardware tends to be problematic and Leo's experience has been less than positive. HP's support is an unknown factor as well. So all those issues tend to cause Leo to look towards other options like Dell, Lenovo and Asus. However, if he chooses to buy the higher end business models, Leo thinks that would be a different story.