Wella vs L'Oreal hair colour?

As an all rounder, which is better?
We use L'oreal in college and upto now i've liked it. It's a lot easier to pick up I find. But is Wella just better?

If that's the case I might apply everything I learn about L to W and get to know Wellas demis when we're learning about demi's etc.

What are people opinions on the products and why?