Nightshade v.2 vs. Z v.2

[prototype561 0]

Hey guys i know this might be a dumb question but what are the diffences between the nightshade and the Z? What does each sub excel at? I hear alot of people saying very good things about the nightshades but not much info is floating around about the Z. I see that both are rated at 1500wrms(im sure they take way more), is one a SQ sub and the other SPL or a combination of both. Any help would be appreciated, thanks

[sundownz 197]

The NS v.2 is 2000-watts RMS.

[The enD 467]

Since we are on the Nightshades, what volume would your recommend for one 18 v2? The amp will be saz2000d at 0.5 ohms. Daily use.