The Filter 8 is nice. It has a lot of features for a filter module. All outputs are available simultaneously, there's a make-up switch to "fix" the low end cutting out when the resonance is cranked (a common issue among filters). The modulation section is well thought-out.
I also like the Morgasmatron as it's two independent multi-mode filters. One filter has a phase reverse, the other overdrive. Both can be switched in or out. I have a Roland 505 dual filter... but it's not as snappy or as "Rolandy" as I would like. Roland doesn't even make their own modular gear... so going with another company wouldn't hurt... as Roland did... lol. But the 505 does come with VCAs controlling the output stage. Which is a nice addition if you are crunched for space.
I own all three filters. FYI.