The Mopho certainly has the better build quality but for the price the BSII isn’t that bad.
Spec wise I can see the Mopho being better. I just never have been able to get anything good out of it in my local Guitar Center. My BSII has made some amazing sounds. Like really weird out there stuff that I have not seen anyone showcase online. I guess I should make a video of some of my patches because I think people do not realize just how flexible the BSII is.
Fun fact. I just saw Haujobb live and one of the only hardware synths on stage was a Bass Station II 