I'm gonna stan the BF-2 here because although it can sound a bit thin/metallic compared to other analog flangers, this can be remedied with the Fromel mod (which I highly recommend), and otherwise it stacks really well, is fairly low noise for a flanger, and can do some weird shit with the resonance trimpot
I do wanna try that new Supro, but most new analog flangers don't feel like very good value for money and the digital ones don't really scratch the itch for me.