Default profiles, like usual, could use a lot of improvement. Don't take them as perfect representations of what we'll be doing.
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Death_Knight_Unholy_T19M_NH ST: 541058 dps
Death_Knight_Unholy_T19M_NH 3T: 871817 dps, 532489 dps to main target
Death_Knight_Unholy_T19M_NH 6T: 1387475 dps, 534169 dps to main target
Tweaking it to be better was pretty simple. The Haste levels in the default profile are baseline so bad that Haste's weight was higher than that of STR. This keeps all M NH gear, so it's still same ilvl and from NH specifically. Tested the aura too and it's still not in, so a rough estimate of ~6% more damage would be 573,518 dps which is a LOT closer than it was showing with the default badly optimized profile. (Speaking on the ST one).
Also this is with Draught of Souls still being bugged in Simc which will very likely be top ST trinket.
Now change this up so that the profile uses it's actual aoe/cleave dps talents too (2230032)
Death_Knight_Unholy_T19M_NH 3T: 922437 dps, 492785 dps to main target
Death_Knight_Unholy_T19M_NH 6T: 1552889 dps, 493048 dps to main target
Death_Knight_Unholy_T19M_NH 6T: 1569344 dps, 513190 dps to main target (2230022)
This is without changing to a possible aoe trinket as well, but it's a big improvement and this is still before the 6% buff as well.
Looks like to me they will be very interchangable, you can do either spec since there's no patchwork fights in NH and their cleave/aoe damage is near the same.