NPA are less bulky, less likely to cause a gag reflex, more forgiving on sizing and marginally easier to train/use. They have more contra indications because of the slim but serious risk of brain damage if used with a compromised skull. Manual airway is great, if that is all you need to deal with and tricky if you need to move to BVM or O2. Getting an airway in whilst they are breathing is better than waiting until they are struggling. In order of preference I'd say intubation, Combitube, laryngeal, NP then OP. But for an FAK for a weight to usefulness benefit a 28g NP probably comes out on top if you know how to use it. There are many levels of consciousness (Not just in Buddhism) and many casualties move up and down the scale. You wouldn't want to put one in an alert and oriented X4 patient unless you really didn't like them but once in how easily they are tolerated is a factor.