I have never heard the Ear but it was on my short list when I bought the Quad. I am very happy with the Quad. It is adjustable and offers MM/MC capability. The Shelter offers plenty of gain for the unit.
It is actually a tube phono pre as it uses a very long life(100,000 hour) pencil tube triode developed (supposedly) for ICBM guidence systems in the 60's. The tube is hardwired and not "rollable".
You will have to audition both, or others, to make an informed choice. I made a leap, figuring I could sell it later, and have been fully satisfied after a considerable break-in period. It killed my PH-3. I was happy out of the box but it has become much warmer with break-in. My only complaint is that it can be a little noisy if you have it living near other components. Not a problem for me once it was located and adjusted properly.
The volume control is supposed to be very well made if you desire to run it directly to your speakers or preamp.
Both are a Tim Paravici (sp?) designed units. I am told the EAR needs some extensive mods beofre it really shines. That may factor into your decision as it did mine.