I have way too many issues with Unity, but the 2 big hitters are.
1.It's not free as in freedom. (Open source.)
2.It's Editor does not support Linux.
Besides, I love Godot. I ain't giving it up, anytime soon.
I saw some videos recently about Godot progress and it seems pretty impressive. I am sticking with the unity for time being, but I hope Godot will become a major competitor for Unity and UE4. Good luck on your next project!