IMHO, the 'imaginary end user' is the problem. You don't know who is going to show up waving a wad of cash to buy it, and it could be someone who couldn't adjust lash if their life depended on it.... or who would give a flip. (I suspect you know the type, and they will want to blame you, the engine builder, for anything and everything.)
If I HAD to choose the cam right now and based on that unknown, I would go for the reliability and leave the HP on the table, to make it a little less likely to be torn apart, and more idiot-proof. But ideally, you would wait for that imaginary end user to walk in the door and evaluate them and their use and THAN recommend the best cam.
(BTW, I run business designing and installing engineered systems and often make choices like this, taking into account that fact that some customers just can't appreciate, or won't care about, the 'finer' points; you have to make it more idiot-proof sometimes.)
Just curious and forgive my ignorance.... why would a solid roller not last thousands of miles? Axle wear?