Also with the hypers you have some issues with the back lobe.
IMO, the back lobe issue with hypers is way overblown. Both in practical experience, and theory. If anyone can spot a flaw with the logic below, let me know.
Yes, hypers accept sound (at reduced sensitivity) from directly behind the mic, whereas cards have a null (at least at higher frequencies). But overall cards accept sounds over a wider angle of space generally behind the mic than do hypers. So I don't think you'd ever have issues with hypers picking up more diffuse/aggregate crowd sound from the rear than do hypers.
So, the concern becomes what if you have a yakker in the seat directly behind you, or one seat behind and to the right/left. (If you have a yakker to the side or in front, you're in trouble no matter what).
First, consider the yakker directly behind you. He should be in the acceptance lobe of the hypers and in the null of the cards, right? Not so fast. Most people run cards/hypers with an included angle of around 90°. In which case the guy behind you is really at an angle of 135° with respect to the mics. So now he's in the null of the hypers but picked up (somewhat) by the cards.
Even if you are running both mics pointed directly ahead, remember that mics are directional in 3-D space, not just a 2-D plane. So if you raise the mics substantially above head height, the yakker behind you is now off-axis to the mics, moving into the null for hypers and moving out of the null for cards.
Now consider a yakker in the seat behind you and to the right. With respect to the right microphone, he's 90° off axis. Picked up substantially more by the cards than the hypers. For the left microphone, he's directly behind. In the null of the cardiod but picked up by the hyper (but only if the mics are at head height). Still, a cardiod is usually more sensitive at 90° than a hyper is at 180°, so overall, he'll be louder in the cards. In the hypers he's picked up fainlty by both mics resutling in a fairly diffuse sound, in the cards he's distinctly in one channel. The way I perceive stereo playback, that makes him more distinct/obtrusive. YMMV.