Bad question. The AR has a huge following because of the amount of goodies around for it. This is largely due to the media in the US showing us all the weird and wonderful gadgets that they can use anywhere. In Canada non-restricted black rifles are "better" for different reasons. Chiefly, because they're non-restricted. I own a SAN and wouldn't buy a restricted long gun because I want to be able to take my rifles out and shoot things with them.
You're asking an apples to oranges question that cannot be properly answered. They aren't all restricted, thus none are "better".
If you just want to shoot at the range, and nowhere else, buy an AR. If you want to shoot gophers, deer, pop cans, etc, then buy a Tavor/XCR/SAN...