Tube or R-2R DAC for Tube System

@idolindian,
You were given excellent and wise advice from @verdantaudio. Don’t over generalize, implementation is more meaningful and worthy of consideration rather than strict R2R vs delta sigma dogma.

"I can show you warm, musical delta-sigmas and cold and bright R2Rs."
Truth!
Charles

Whys is tubes and R2R a choice? Why not both if you happen to think they are to your liking?
Orthogonal decisions.  Like "V8 or red car?"
Anyway i personally think that choosing by technology type is not particularly valid. I can make FETs, BJTs and Tubes sound pretty much alike.  Choose the product that you find musically enjoyable.

generalizations are not true and it really comes down to implementation.

Bingo. When they are true its someone using a brute forcet echnology to overcome design limitations.  "I cant make it warm and natural so I'll throw in some tubes".  Pass, with apologies to Nelson LOL.

Don’t put yourself in a corner. There are many excellent dacs 
besides R2R dacs  the classic Multibit dacs are used still by many companies like Analog devises 1955 chips used by Briscati  BB1704 used by several companies ,and other Multibit dacs 
which are R2R in practice they are all incorporated on one chipset 
and were very precision built all laser trimmed and very time consuming that’s a big reason they were discontinued .
in fact Briscati upper dacs incorporate a choice of filters ,Multibit dac ,as well as R2R dac, as well as a great Roon ready streamer module.seperate DSD ,as well as high quality analog preamp section .

In my own analysis of this it seems like the most compelling DACs in these categories may be:
R2R Ladder:
Denafrips Terminator Plus
Holo Audio May KTE
Tube:
Doge Audio Clarity 7

Others may have other suggestions.