The Magna has a built-in LPS. Wyred4Sound does not.
There are many other ways to get an i2s connection but Magna is the most cost effective. And the support is excellent.
To get equivalent performance from a RasPi costs as much plus more work.
Rob has done it for you and put it all in a nice case.
A Denafrips DDC that converts anything but USB costs 30% more than the whole shooting match. I put a Synergistic fuse in mine, no discernable improvement over the installed HiFi Tuning fuse so forget that. All you can do is a power cord. It's not very sensitive to isolation either.