I tend to believe the choice to (tube or not) in your DAC can also depend on what you are using for your preamplifier and amplifier.
In my case with a tube preamplifier and mono tube amplifiers in my primary system, also having a tube in the direct signal path within my dac was a bit much.
Now, however, if I had a solid state preamplifier and/or solid state amplifier both, I'd potentially lean back towards a having a tube in the signal path of my dac.
Currently I split the difference and went with a dac that has a different design - with a single tube in the power supply part of the dac rather that directly in the signal path. The design offers the ability to switch the tube on/off too which prouduces a different type of sound in each mode.