(Ranger) Raid weapons comparison

[Fanguru]

I am trying to figure out which raid weapons are best for a ranger.

This spreadsheet seems in bad shape.

DPS rating for offhand does not take offhand damage into account but uses delay twice instead.
Offhand weapon ratio is always 1 (delay/delay).
Primary hand uses 2h haste cell.
The formulas do not use the STR, weapon skill or ATK value.
Double attack value is never used (I suppose this should not affect the comparison).

In details, I would like to know if Horn of Hsagra (13/20) is better than Swiftblade of zek (11/18).
There is probably another parameter: mob AC. I suppose horn is slightly better by a small margin. This is confirmed by my cleanup of the above spreadsheet.
However, this may not be true if the mob has very high AC, in which case the smaller delay on swiftblade would apply damage bonus more often.

Same question for Swiftwind (13/21 and 30 atk bonus) vs Claw of Lightning (14/18, no atk bonus).
The question becomes harder, since the atk bonus from swiftwind also affects primary hand damage.

I suppose I could invest in getting each of them and parse fights, but I would rather know beforehand.