Actually Unity pretty much invented the asset store. I don't have the time or patience to look it up, but I'm pretty certain Unity has a far bigger "asset" selection online. Though the thing is, quantity of stuff is not really a sign of quality.

If anything, really, GameMaker has far, FAR more stuff to download online than any of the previously mentioned engines. In fact, there's literally more than a decade worth of stuff for it. And it recently even got an asset store of sorts for it as well.

No game is easy to make, unless it's your typical "floppy burd".

Also, please don't double post. That's what the "edit" button is meant for.