Are you kidding?
The Euro is backed by assets.
The USD is backed by US Treasuries - i.e. the faith that the US government can repay it's bonds.
That alone makes Euros more 'solid' than USD.
In 2008, the Fed absorbed Trillions of dollars of worthless real-estate assets onto it's balance sheet at par value - so as to get the toxicity off banks balance sheets. One day (hopefully when those assets have recovered) the banks may have to take those assets back, but this remains to be seen. This might be the greatest incidence of financial fraud in the history of the world.
The ECB has much stricter policy because Euro states don't trust each other. Do you think that Germany will allow 'money printing' to give Greece cheap loans? Or Poland? Of course not. The only way that the Euro could work is if it's a fairly strict currency.
The Euro is a very strong currency. (back by assets)
The Dollar is a medium strong currency. (backed by a government, with some odd manipulations)
The RMB is a fantasy currency (worth whatever the CCP says it's worth).