Of course you can compare them. A quality offsite place costs $X, and BWV costs $Y. $Y is significantly more than $X. The question is: is that location worth $(Y-X)?
The answer is: Not always, and certainly not for everyone. And that's before you consider that the offsite place is probably a 2BR timeshare, because they are not that much more expensive than a quality offsite hotel room.
I've stayed in a bunch of DVC resorts (BCV, BLT, BRV, BWV, OKW, and SSR). I've also stayed in several of the better offsite resorts. The Disney resorts have some advantages, for sure. But in my experience my offsite stays also delivered great vacation experiences. For most people, the offsite vacation also leaves a lot of money in their pockets.
Edited to add: I will caveat this by saying we drive to the parks most of the time whether we are staying on-property or not. The exception is MK, but even then we will drive maybe once a trip to take the ferry across.