Chimay Blue which you probably tried is a brown & sweet beer. Orval has a lighter colour and has a more complex taste with bitterness and some sweet tones.
I choose Orval over Chimay Blue any time, although I like both. Would certainly recommend you to try it. I don't agree with the 11/20 here. But the rating is subjective of course.
I actually wrote about Orval as well last week in my Beautiful Beer Labels series: https://steemit.com/beer/@davenumero6/beautiful-beer-labels-1-orval
Great, I will do some digging to see if I can find Orval anywhere around me.