Should I update my iPhone 4S to ios6?

I mean there's no difference I already have Siri and I'd lose my preloaded YouTube app? What should I do?

You should update it. The YouTube app in the Appstore now (by Google) is much better than the one that used to come preloaded.

Everything is to do with the maps.

Yes you should I did it will make things better and stuff so yea