Originally Posted by
Motenten
Maybe.
Edit: To clarify:
Base for VS is 2.4 fTP plus 3 additional hits, for 5.4 effective fTP, 5.5 with gorget, and 5.6 with elemental belt. Adding the belt would then be 5.6/5.5 = 1.82% increase in damage.
However once you factor in DA and TA: 5% Brutal, 15% AoA atma, 5% VV atma, and 10% /war, we can get up to 20% DA and 15% TA. That extends the average number of effective hits to 6.44 with the gorget, and 6.54 with the belt, making the belt a 1.55% increase.
+7 str from Black Belt is, generally, +3 base damage from WSC, along with +3 attack. The +3 attack would be around +0.5% damage if you're not capping attack. That means the base damage on the Black Belt needs to account for between 1% and 1.4% of total base damage to be on par with the elemental belt.
With base from skill is 44 (assuming no +skill gear is used during weaponskill) plus 31 (Revenants) or 35 (Verethragna), for total base damage of 75 to 79. Add in fStr and that increases to 86 to 91.
For the +3 base damage from Black Belt to reach +1% base damage, total base damage needs to be 300 or less. Factoring out base skill and weapon, that means a WSC total of 210-215 or less, which would require less than 500 str. That is almost certainly the case, so Black Belt is equal/better than the elemental belt at this point.
To reach 1.4%, total base damage needs to be 215 or less. Factor out base skill/str and you need 125-130 WSC, which would require 300 str. Once again, almost certainly the case, so Black Belt is still better.
To reach 1.8% (no DA/TA, capped attack) you'd need total base to be 166 or less. Factor out skill/str and you need 75-80 WSC, which would require around 180-190 str. You will almost certainly be reaching this point if using VV atma, and should with the lower str atma set of RR+GH+AoA as well with a decent ws set. At this point, the elemental belt is better.