In truth there are a lot of grey areas when determining the best gear to use to maximise dps. However, in absense of anything else I reckon that Landsouls spreadsheet does a great job of helping us choose our gear. I notice a LOT of questions in this fourm which could be answered very quickly from using this sheet.
And, believe me, it can thrown up some interesting gear combinations.
I had previously dismissed sword specialization having read countless times that it is dramatically inferior to both mace and poleaxe. Despite that I'm now using Aesir's Edge based on calculations int the spreadsheet - and seeing the benefits in raids also (Usually averaging 5.5k on XT Hardmode in Ulduar10 as a reference point). It is interesting that, according to the spreadsheet, the next upgrade from this for me would be Lotrafen. I was surprised to see that Worldcarver was a dps loss despite being an Axe.
Poleaxe spec is obviously better, as the Lotrafen upgrade highlights. However, the difference between sword spec and poleaxe is not as big as I had imagined and the stats on the weapons in question still have a large part to play in determining which is better (The stats on Worldcarver are not great for an Arms warrior).
Anyway, try Landsouls spreadsheet - damn useful and insiteful!