For unity, I can't say anything because I haven't used it.There is something to be said about the simplicity of the WE.
For me, it is Unreal Engine 4 (easiest development tool) -> wc3 WE -> sc2 Galaxy Editor -> Blender Game Engine (hardest development tool, dont use it)Yeah, the Galaxy Editor (StarCraft II) is somewhere in between I guess?
It's been written about quite a lot in this forum. So I though why doesn't Hiveworkshops staff get together with the community and we together create our own game engine & editor for us all that's based on the wc3 world editor? So we can make standalone games instead. I bet a lot of people would pay for that to happen.
It's of course much easier said than done, but it would be a dream come true. "The Hive Editor" or something noice like that.