I have just received the RRS TVC-34L and the PG-02 gimbal head. I really didn´t need it, but Neuro and Elm58 talked me into it
In the image you see the Gitzo GT3542LS with the Wimberley Gimbal II head, fully erected. The RRS has only 3 of 4 legs extended, so it can be significantly taller. I am 6 ft and can stand straight behind both as they stand.
From a stability perspective, I have to give an additional point to RRS. It feels more sturdy. But I have used the 600mm f4L IS II, with the 2xIII extender on a 7D body, equivalent to 1920mm, on this rig. And it works (the actual problem is finding the subject in the viewfinder).
The Gitzo has a handy quick head base release function integrated in the head. For the same function on the RRS you need tools. But by using an additional QR clamp, you get the same with RRS. I know Neuro is using this. It tilts the cost issue further in favor of the Gitzo though. But if you are using a leveling base, which i strongly recommend with a gimbal head, there is no difference.
The RRS is a bit longer when collapsed. But the head base diameter is smaller, so from a transport perspective I believe they can be viewed as equals.
They can both use the same leveling base. I use the RRS TA-3-LB-HK leveling base on both (on the RRS in the image).
As for the Gimbal heads, it is difficult to vote in favor of any of them. Functionally they are both great and I can live happily with both. The RRS looks more exclusive and it packs a bit more compact (not much). I actually thought the RRS would have been smaller.
The votes of the Norwegian jury?
From a functional perspective: Slightly in favor of the RRS tripod, for a bit more stability and the extra height. For the gimbal heads, it is a draw.
From a look and feel perspective: I have to give it to RRS for both tripod and head. Every aspect of their products radiates quality. But you are paying for it.