PS Audio Direct Stream DAC w/Roon Nucleus + vs. Auralic Vega G1

That mainly has to do with vinyl distortion which is considered pleasant to the ear. Some like it, I personally don’t I like accurate reproduction. What would help if you find digital fatiguing is EQ. You would probably notice more difference than anything you’ve mentioned by attenuation in the 2khz- 4khz region which the ear is most sensitive to. You don't mention your speakers. Might be they lift a bit in that area. 

@pscar

my opinion is rather different from djones here

from my experience, i do believe you will get a smoother more natural presentation if you improve your DAC from the Mytek unit ... the brooklyn is known to be a very clear, but sometimes thin/harsh/strident/edgy sounding piece, compared to other smoother, sweeter fuller sounding dacs in the same general price class

your notion of trying a PS audio DS, Denafrips, or something else from the R2R school such as a Metrum, MHDT or Audio Mirror should pay dividends in the nature of SQ you seek

doing so will not necessarily have the digital sounding just like your vinyl, but it will be a substantial, immediately noticeable move in that direction

final note - the ps audio ds is software upgradeable, won't become obsolete anytime soon (they do upgrades every 6-9 months via download)

DACs have gotten very good these days, so I’ll give the usual hackneyed advice: Try Before You Buy. A "better" DAC may not sound better to you.

That said, I am an one who aims for neutrality -- not a warm sound, not emphasized treble. When I borrowed a Brooklyn for a while, there was only one filter setting that I enjoyed. The rest seemed a bit edgy TO ME.

I urge you to audition carefully, because what you choose at this level will be a matter of taste and how it complements the rest of your audio system.

The most important part of auditioning DACs if at all possible,  do so without knowing which one you're listening to so you choose with your ears not your eyes or notion of if it costs more it must be better. Well designed DACs whether R2R discrete or chip and Delta Sigma are extremely hard to tell apart when evaluating blind. Some use filters or tubes etc.. in order to EQ the signal and that's fine it just makes more sense to apply the EQ at the speaker level. It's much easier to achieve the same effect for less money and easier to find a sound more pleasant to you. It would be interesting to know what speakers you're using to look at the FR, if it can be found, to see what's going on the the areas the ear is most sensitive to. Another way you can tell is if you have a calibrated mic and REW. Do a FR sweep leaving the mic in the same position switching between DACs. If the FR is the same or within .01%  then I doubt the DACs could be told apart. 

I can't comment on the Auralic you are considering or the Mytek you own, but I have the Directstream DAC/Roon Nucleus combination and am very pleased.  I've owned the DSD for more than two years so I have updated the software a couple of times and feel each update has been an improvement.

DACs are changing so fast now that an upgradable FPGA based DAC is a big plus in my opinion.

Understand that these improvements are rather subtle but they are discernible.  The updates don't change the overall sound of the DSD (neutral to maybe a bit warm, certainly not edgy) they typically eliminate noise or other artifacts.

I too have a PrimaLuna Amp (Dialogue Premium HP) and they are a good sounding match.  My preamp is also PrimaLuna so your results could be different there.

One last thought on the DSD.  I originally connected my Nucleus via USB (CuriousCable) and was very happy.  I also own the DirectStream Memory Player and was really happy with the sound with them connected via I2S.  So, I bought a devise that was recommended by a number of people on the PSAudio Blog to connect my Nucleus via I2S.  I use a Matrix X-SPDIF 2 that converts the USB to I2S.  It is a fantastic sound in my opinion.

I hope this is helpful.