Simple question, hopefully a simple answer. I was dw frost with a pair of Treachery's Bites and recently acquired a RF Gurthalak. I presume from reading here and other places that Unholy > Frost dps with a 2hander? I've seemed to be up and down since I changed specs as I found frost had a bit of a flow to it that I have yet to "feel" with Unholy. I recall back in the day certain specs required a particular gear level (or selection) to really shine. I haven't seen that stated in the 4.3 era.

Amory link if it matters.
Vuloth @ Dalaran - Game Guide - World of Warcraft

In short, stick with UH or swap back to Frost?

Vuloth

PS Thanks in advance

Firstly, few steps of correcting your mistakes which may make you to "feel" Unholy.
You must have 8% hit, it may be more, but non the less-that's not for you, but for your pet's expertise. The expertise on your hero, however, should not be capped and should be forged down, you're not frost DK and you're not loosing much around loosing 1 GCD.
Reforge yourself to hit8%>haste>crit,
then read Magdalena's topic about UDK and fix other mistakes, then you may feel the Udk's gameplay.

In short stick-UDK+Gurthalak>Fdk without 1600-1700 haste(well, that were my thoughts when I played frost for 2 patches)

So I do not want expertise at 26?

No, expertise is next to useless for Unholy.