Yes,for me and my system the mids are more immediate and dynamic vs. the VO. However this is more complicated than what it would seem to be.
I roll very,very warm tubesfor the VO as I found that it maximized the holographic presentation of the VO. When getting that "3D-ness" something had to be pushed to the rear,and often times it was the mids,mainly guitars and sometimes vocals.
The VC doesnt seem to have that ridiculous depth that the VO has,which isnt to say that its not there. Quite the contrary. The VC is quite holographic,but ive yet to be able to manipulate it with tube rolls to the degree of the VO .
I prefer the default pads,Auteur non-perf. To my ears it was the best combo of depth,width,height,detail and bass. You can get stronger bass(if thats your thing) with other pads,but I found that the staging suffered.
My current tube combo that ive been stuck on for several months is:
GEC U18/20 rectifier
pair of GEC L63 w/ adapter
GE 6x 6BX7s. Ive been meaning to roll in some Sylvania 6BX7s but havent gotten around to it.
In my system the tubes listed above and with the Auteur non-perf pads give the VC a beautiful nice,clean,tight,fast sound with next to no bass bloom,which is the sound that I prefer. It fails with no genre of music and at no time have I ever been left wanting for an element thats not there.
I have not heard the Echo,so I cannot say. Each amp is different,and while there are some tubes that are generally regarded as superior to others,its hard to predict how any given tube will sound in your amp.
I would recommend finding the Echo thread and read what other owners are using for tube rolls.
Tubes can be quite expensive so when you go shopping for NOS GEC,or WE or Fivre tubes be prepared to pay for them.
Also beware of scammers and fake tubes. Believe it or not lots of people will slap a GEC logo on a $5.00 Russian tube and sell it for $300.00
EDIT:
Understand that the tubes I use in my system is how
I prefer it to sound. There are other GOTL+VC owners in this thread and they may prefer a totally different tube combo. Zach himself uses a different roll than I do,so the takeaway is there is no right or wrong tube combo here. Its all about your system and personal preferences.
If you have yet to hear the differences swapping tubes can make be prepared to have your mind blown.