"you can use bigger files thats it"

Not wrong, but not right. If your 32-bit renderer must use virtual memory with a lot of swapping to disk, and your 64-bit render can keep everything in RAM, then the 64-bit renderer will be faster.

But, bigger files is nothing to sneer at. Anyone who has set up a render, and had FireFly crash 1/3 of the way through will greatly appreciate the ability to render scenes that require more memory.

lmk

Probably edited for spelling, grammer, punctuation, or typos.