Best Value Line Stage Tube Preamps?


Given they are all multi-input, multi-output, balanced line stage tube preamps, what are sonic benefits of a serious Rogue RP-7 or Prima Luna EVO 400 vs. the $899 Schiit Freya Plus? Currently these would feed a Parasound Halo A21 into Legacy Signature SEs, with all cables and speaker placement constant. I know the relevant mfrs/dealers all offer trial and/or return policies, but living far from any source and disliking return hassles, I'm soliciting expert opinions before (preferably, in lieu of) undertaking in-home experiments.
I know that much depends on one's own listening habits and sonic signature preferences, but surely differences in power supply, output impedances, etc. might be objective benefits to spending the 5x more coin for a bigger, badder device?
hickamore
I’m listening to Eva Cassidy Best of....and saying to myself, I don’t want to change anything to mess this up. Tung Sols...Freya Plus. Thinking everything is well settled in after about 300 hours. I can’t give an expert opinion because what works in my system and in my room may not be good for anyone else and I will always consider myself a student. I have a temporary housemate who just walked in sat down and said "omg, I can feel her emotions" (Aint no Sunshine) Guess it passes the test.
Very helpful, melm, much appreciated. Especially the news that Freya+ no longer gets Tung-Sols, yet tube rolling is easy. Having heard nothing to the contrary so far, any reason not to start with Schiit and if displeased, trade up for big boys? 
 As far as tube sockets are concerned, it does matter if they are mounted directly to the circuit board or not. If so, then it is a matter of how much flexing will that circuit board take before trouble starts. In the case of the Prima Luna, I believe that first off there are no circuit boards to worry about in the first place, and the tube sockets are mounted directly to the steel chassis. Somebody please correct me if I am wrong. Point stands that there are certainly different levels of quality and engineering that should be taken into account.
Inspire by Dennis Had
MODEL LP-3.1 LINE STAGE PREAMP

https://www.ebay.com/itm/STEREO-TUBE-PREAMPLIFIER-INSPIRE-by-DENNIS-HAD-MODEL-LP-3-1-LINE-STAGE-PREA...

This should be a very good preamp if you can live RCAs; and frankly, I don't think one needs balanced for home audio.
Your are correct 4krowme.  Tube sockets are mounted directly to case and no circuit boards and sounds super....I have one