I don't understand your question "Easier to make Heros". It's the same "difficulty" as wings and swarm.
I never personally have never worked on world editor in WC3 but for what i understand it is nowhere as advanced galaxy editor. You can make pretty much everything you can think of in galaxy if you put your time and mind to it.
Is it going to be easy? No, but to say "I'll just wait for W4 and it's editor" and bash one of the most advanced "free" map editors with tons of assets provided due to it being "hard" just blows my mind.