Here is my submission for the Eevee vs. Cycles Challenge. I was actually planning to use Cycles, however, in the end I rendered it in Eevee.
Still I believe Cycles is more powerful when it comes to realistic renders, if there was not the long render time... Eevee is great and I was surprised that if you tweak the settings a bit, you can still get a fantastic result! So my answer to Eevee vs. Cycles: Both are great and which to use totally depends on your project ;)