Jb0194:
Line arrays affect sound dispersion patterns. They roll off less at distance and have less side radiation so that side wall reflections aren't as critical. In fact, any driver that is larger than the soundwave it's producing has the same effect. So, planars can be similar to line arrays in that way.
Line arrays are usually dynamic, efficient and spreading the load between drivers increases power handling. The downside is a chorus of drivers and the cost, paticularly done well. A dozen 4" drivers does not quite match a single 12' driver's characteristics and vice versa.
Acoustic suspension (sealed) and bass reflex (ported) both have their pro's and cons. Bass reflex is more efficient but more likely to have a resonant frequency. Should I mention transmission line?
Check it out, I managed to get through that without saying "better". I'm so PC.