I'm not sure on the coil stats of the LVL-5 so hard to make an educated guess... I do see people running lots of juice on them, though.
The NS v.2 uses a 71mm long 8-layer flat aluminum coil standard -- it does sacrifice a bit of absolute thermal handling for a Stainless Steel former. These formers are a bit more efficient in all of our testing, though, and end up requiring less power to reach a given dB level. I have heard from customers from 0.4 to 0.7 dB difference. But, again, absolute thermal handling goes down as aluminum is a much better heat sink material -- we chose the more efficient material, though.
They are rated for 2000-watts RMS power handling.
The LVL-5 does feature a larger motor and presumably more motor force factor as a result of that -- of course that isn't related to power handling per this topic.
Either driver is, IMO, quite capable.