The difference

There is nothing wrong with cheese as a strategy (or an all-in like the 4 gate), but it is important to learn how to macro before you learn how to cheese in my opinion. I only started cannon rushing last year, after playing since the WoL beta.

I macroed my way to high plat, and I probably currently have mid-diamond macro skill. Once you have a solid macro foundation I see nothing wrong with playing a cheesier style, but I wouldn't recommend starting with it.