I'm a huuuge BB fan, I'm even drinking tea from my BB mug as I type this...but The Wire is in a completely different league than BB imo.
You can either take The Wire at face value as simple 'a cop show' (the same way so many people think that The Sopranos is simply 'a mob show'), or you can watch it as the multi-layered social commentary it was intended to be watched as. The latter is what makes it above anything else I've watched for me.
I know what it's supposed to be. I'm just saying, at the point I'm at in the show, I put BB ahead of it.