I'd prefer one or the other, and inevitably when seated, the action is always going to draw the crowd to it's feet. I've failed to see what the issue with standing in grounds is? I don't see how 60,000 in the Etihad stood or sat makes a differnce. It's the same number of people, and no chairs to be pushed over.
I recall Arsenal away, naturally standing for the whole game at the Emirates. The ground is that well designed and spacious, with high back chairs, you can stand and lean back on them, totally unaffected by supporters walking infront of you.
Bring it back.