I have found that the polar pattern of the card reduces the crowd more evenly than hyper or shotgun. When I run my cards the crowd chatter is reduced fairly well. When I run hyper, and esspecially shotgun I find that the crowd is reduced extreamly well, but the rear lobe will pick up someones conversation behind me perfectly. So instead of having a little bit of overall crowd noise with the cards I get one perfectly clear and annoying conversation with the shotguns....
So, if there is a bunch of talkers on my sides and not behind, I will run a very directional capsule. If there are just people behind me I run cards. Outdoors I run my stand in the stratosphere with the shotguns...
Lots of variables in this hobby. Room acoustics, PA, mix, mics, pres, recoreders, crowd, environment, playback, taste, etc... That is why this hobby rocks! There is no one perfect rig, perfect placement and perfect sound guy. Every day at every show you are faced with something different. Good luck out there tapers!