Oh no need for that, I've tried both your rune pages multiple times and they are always effective. What does annoy me is that I'll need to memorize them most likely, to make sure I can use a build most optimal for the current game. Problem is, whether I choose Rhaast or Shadow Assassin seems to be dictated more from how many ranged or melee champions are in the enemy team, instead of whether my team needs a tanky bruiser or not. That's not to say waiting to choose the loser form is out of the question, just that, since this is a game that requires APM, waiting in a form that's pretty weak seems like a bad idea.