Whats the difference between the objects?

Question

So I got bored and wrote this:

https://code.sololearn.com/c4lb3Nk7mu4j/?ref=app

If you look in main, I created objects in 2 ways. What's the difference between the 2 ways? Is one better than the other?

Answer 1

~ swim ~

So another question I just thought of

In a game, for example, Halo 5's forge, when I spawn an object from the menu, would that be like creating an object on the heap?

Another example would be Minecraft when spawing a creature or placing a block.