The Back Lock has a resounding THWACK! when it engages. It sounds like a vault or something. I've never heard a back lock sound like that when engaging. Not only that, but the knife actually vibrates with the force of the lock up. I love it.
Yes, the LW is a lot easier to carry, however, I like the feel of the BL version, too. Both are great and I have and use both. They are very different in feel from each other.