Geopanels and Protection Bonuses in Disgaea/PB respectively force you to use some semblence of strategy or get owned. Even a level 9999 god character can't bust through an Invincibility Geopanel/Protection. On top of that, PB adds the concept of Remove, so if you can't get your 9999 to your target fast enough, he's outta there. That said, both games are less strict SRPGS and more hybrid SRPG/puzzlers with a massive portion of stats management.
PB > Disgaea, BTW, although both are godly.