If you're planning on rolling the IK, get the NRS straps. The Aire straps will break time and time again with the force from a back-deck type roll.
If you aren't rolling the IK, get the Aire straps. They're super comfortable, easy to get on, and the fact that they break away is an asset should you pin. The designer of the Aire strap told me that they intentionally made a weaker strap to prevent you from getting pinned in the boat. That might have been bullshit, but his point is true, the weaker straps are a bit safer.