What does it take to beat out a Thrash Blade?

[Concillian]

A useful tool for answering these questions yourself: ProcWatch.

I'll just say that there are plenty of ~40 DPS weapons out there that I would use over thrash blade, but much under that it certainly holds its own.

If you enjoy the extra attack on proc phenomenon, I would reccoment messing around with sword spec sometime, as well as doing quite a few BRD runs to get yourself a Hand of Justice. I see a lot of rank 14 warriors with mostly epics still using that trinket, and there's good reason for it.
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Sword spec is impossible to use with protection spec, but if thrash could proc on the sword spec proc, I can see how that would be a rather large benefit. Still I'm not sure it would beat out the 1H spec bonus of +10% overall damage on 1H weapons (though the other arms talents probably would be a larger total benefit)

weapon DPS is only a small part of my total DPS. Thrash is adding at least 5% to my total damage, I think it will take more than a 5 DPS increase on weapon, given that the majority of warrior DPS comes from STR and Battle Shout in the form of AR. But I'll download procwatch and check it out (hopefully I won't have to increase memory for add-ons again.)

I can also document what abilities it works on. I know shield slam and bash can activate it and I know I've never seen sunder proc it (and I sunder quite a bit when solo). Cleave can proc it on either hit. I don't use whirlwind enough to know, but assume that can proc it on any hit. Retaliation is another I'm unsure of.