I feel like nox may outperform both in some situations but never all, they all have their advantages but the nox is really light. I swung it 5 hours yesterday with the big coil on the wetsand and the time flew, in the water it's got alot of drag to it though.
Personally I'm starting to think the a nice PI like the new whites tdi for the water and the nox for the shore is the winning combo for my beach hunting needs. Seems many prefer the excal over a pi machine but from my personal experience time and time again I've seen my sandshark outperform the excal in the water and it's hard to keep just calling it luck. I've sold that machine so now I'm looking to go deeper in the water. On the land the equinox is hard to beat although I'm 50+ hrs in and still getting accustomed to the tones in beach mode you can move so quickly and it's so responsive even with the 15" coil on it.
That's my opinion, it's a great machine, will perform at similar levels as the excal and ctx although it wont have all the bells and whistles it is nice and light.