With a Valve Phon' there are a few designs out there from different Brands that can vary that are very noticeably in the Sonic Traits, SQ and Presentation.
Firstly in my mind there is nothing much wrong with the variations to the presentation on offer, as from my experiences encountered certain types of music are much more endearing and attractive when encountered through one of the different presentations that are available.
The only Brand I have received a demonstration of in your shortlist is the Modwright and this took place a few years ago. I do not have a precise recollection, but do recall my thoughts leaning toward the Model I heard as being that the device would be great to listen to Blues Music on, the Blues with a Chicago Origin as its foundation.
It is a shame that a home audition is not available to be arranged, this would be very valuable to your fin al selection process as there are noticeable difference between certain models.
My experiences undertaken of listening to many Valve Phon's over many years, leads myself to describe the delivery from one type of Design/Model as having a Richness in the Presentation and certain designs with this trait can have a perceived Bloom in the Bass Note.
There are the Design/Model that can create a psycho acoustic effect, where there is created a perception that the Listening environment is with much more Volume than is present and the ethereal exquisiteness can really be captivating.
There are then the design/ Models that when compared to the former, will be said to be quite transparent, this is my preferred presentation, and my Phon' is Valve Input/Output bespoke built model, where I was quite fortunate to be invited to take part in selecting/deselecting the components that were producing/not producing my preferred presentation.
The Perception of a Valve Input/Output Phon' being Transparent is in my view a misnomer and another psycho acoustic effect, as when a Valve Phon' of this type is demonstrated along side a Few Solid State designs, this is very quickly learned.
Even though I am at certain times blown away by the capabilities of certain designs of SS Phon', I am always at my happiest with a Valve Phon' at the helm.