I came from Cryengine just last week.
I left because I’m a Blender artist, and Cryblend is just ignored by Crytek, as well developed as it is, so they cannot complete it.
In my opinion using both:
Cryengines graphics and physics are certainly much better and more optimized, but Unreal has literally everything else. As much of a graphics ***** as I am, it’s documentation and support that matters the most when it comes to actually using the engine. And UE4 is definitely pretty enough, it’s just the lightmap baking and building that really turns me off. Plus I was able to create a 2.5D ocean shader in a day with UE4, so I’m pretty impressed with the capability. I just really wish we could switch to full dynamic lighting, it’s soo much less hassle, at least until we’re done working and then bake it.