Got the BS2 and the MB2S. Two different animals imo. BS as others have said has patch storage, better midi etc. The MB2 filter is nice If you like it. It’s flexible too but for me the BS filter has more sweet spots. The MB begs to be be hooked up to other gear and to exploit the patchbay. The MB internals were improved with the MK2 range as was the build quality. I tried an MB2 once in a store and the keybed felt lovely. I’ve got the original MiniBrute and the keybed disintegrated on that so I can attest to the increase in build quality. The sequencer on the MB2S its it’s USP. It beats the BS2 hands down. It’s also a good size, nice and chunky with plenty of good sized controls.