To be honest. I think things are rather situational in the argument of PA vs Lion. However, a core Lion vs PA mid something rare to see, I lean more on to Lion because 1) He has disables. 2) Disables make it easier for gank rotations. 3) He sucks mana. Although what Hyperion said is true,(and also true in reverse since PA has slow) Lion can easily screw up PA's last hits by his disables, though it is not something that is spammable(unlike PA's dagger) the sucking of mana part is what gives him the edge. It renders any effort for stifling dagger last hit useless if you sucked all his mana and a magic stick can almost always save you from the issues you will have from stifling harass early on. But this really is a battle of attrition.