As an athlete myself I really like the Nike JaFly 2 for hurdles—I have a very narrow foot, especially in the heel, and it grips perfectly. Which brings me, as a coach, to what I always stress to athletes: the foremost concern (other than the spike in general being appropriate to the event) should be how it fits your foot. That the JaFly 2 is awesome doesn't negate that the Celar 5 by Nike is as well, but it's cut wider—so if you have a wide foot, check it out.
In contrast, I found the Nike Zoom Rival XC 3 from 2014 (I think) far superior to their 2015 edition of the same shoe. It fit better and had better flex in the forefoot. The Victory XC, their top-end XC spike, in contrast has too much flex and kind of pinches—my experience and that of several other athletes.
All the newer New Balance spikes I saw at Nationals last year seemed impressive. Athletes who bought them at Nationals and wore them in events that day or the next day (and yes, plenty of people seemed to do this) seemed to feel they broke in immediately and were comfortable and effective. Saucony, which I have limited experience with myself, seems good at making very durable spikes, something Nike's falls short at at times.
I really, really, really want to stress however is that the best spike is the one that fits you personally best. If it fits poorly, I don't care how good its tech is.