I think it has been written many times on here that the pancake sa doesn't really appear to add much ability for the pancake stat. If you want pancakes, your player needs to be built well. In my experience, you need strength, blocking and agility for pancakes. Those are the highest attributes on my LOT and he has done pretty well over his career for pancakes. The pancakes are nice for stats, but I look more to make sure he doesn't give up the sacks and hurries on passes and opens holes on the runs.
I would take the hold block piece in all cases over the pancake piece, not to mention the +3 vision. Let your build get the pancakes.