Ayre QB9 Dac . Upgrade to the new QB20. Vs competition In the $4-5k range or less


Hello I am looking to find out regarding the New Ayre upgrade for All QB9 dacs to the New QB20 Dac 
i see 1 review and  reviews many times are in part swayed with $$.
how good is this new upgrade ,and how would the QB20  and Schitt Yggsdrusil stack up 
and compare with each other . For these are my 2 options , please do chime in ,Thanks much.
128x128audioman58
@audioman58 

Thinking putting an Orange SR fuse in my Yggy.  What value and size fuse did you install?
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docknow I put in the new unison usb card 2 x it would not work
i already have a Jcat femtocard inmy computer for usb withalinear power supply to it, the unison usb card , when they come out with a
analog 3 then maybe I will get it the orange fuse made a Big sonic jump in musicality vs the stock fuse !!
For the record ,the holo springs  top May edition 2 Box   R2R dac
$4995 great, non better at under $5k just do a search ..
under $3k no brainer Denafrips Venus R2R dac ,under $2k Denafrips pontus 2.  My friend has the Holo springs May. Dac 
I am currently saving for that. I had the very good pontus mk2 dac,
I bought the black ice Audio wifi dac mi use ethernet cable it has tubes, BB dac, and I totally modded it vh Audio Odam caps WBT connectors Furutech IEC,neotech -0 crystal copper ,bypassed the volume control excellent dac now.