If you're at SF you're going to be recommended the Heritage—if you go over to EL it'll be the BSOD. That being said—
The differences in the board aren't going to be noticed right now, the camber loading on the BSOD and Heritage won't feel too different at your level so it's a largely moot point, a difference you'll see though is the turn initiation on the NS is much easier being a more rockered less stiff board while the BSOD is mostly camber and stiffer.
Going forward however, I've tried both and the difference is in the camber—the Heritage is more squirrely at speed due to the location of the rocker past the bindings whereas the BSOD is more stable under foot on hardpack/corduroy/while carving since the camber is between the feet. Subsequently, the more pronounced camber, as well as its location, on the BSOD makes it also a better feeling carving board than the Heritage.
A few other differences is the warranty 3yr for the NS, 2yr for the capita. The BSOD is also lighter, the textured base on the NS is a bit more durable and the BSOD is a bit narrower excluding the "death grip."
For reference I used the Heritage 158 and BSOD 159 in varying conditions groomed snow and powder in BC for three days a piece.
First off, thanks for the post. Second, what is EL? (I'm guessing another forum but can't determine the name).
I'm hoping to be able to demo a NS Heritage in a couple weeks. Demo's a Libtech TRS a couple weeks ago and it felt a bit squirelly like one of the posters mentioned. It looks like I may find a place to demo the BSOD as well. Best situation is I get to demo both. If not, I'll have a tough choice to make