I currently own the Am Pro II and used to own a California VS4
I don't need to talk much about the Fender - it does what it does and does it very well. Mine is easily the nicest Fender I've played and is a keeper.
I owned the Sandberg from new. Firstly, it was without a doubt the best constructed bass I've ever seen and the neck was lovely but I just didn't bond with it I also realised i'm not a massive fan of active basses and even though the controls were simple, it turns out i'm even more simple-er. In hindsight I should've chosen a passive model with a more vintage voiced pick up. Despite that, it was a beautiful thing.
You can't go wrong either way