I don't think in terms of volume of vapor. I think in terms of satisfaction. And my definition of max clouds will be different than yoursI posted a question about my soon-to-be-here P3, but since I also have two P 2.5s, what would be the best tank/coil combo for max cloud without going the sub ohm route (which I don't think the P 2.5 can do anyhow)? I always see their videos on their website and those people are blowing some serious clouds.
I suggest getting several tanks and trying them with different builds till you find what will satisfy you.