There are sound comparisons on YouTube, links at this post: Badass or Babicz bridge?
I find the heavier zinc bridges comparatively "scoopier" than the lighter aluminum, so I would guess that brass, being on the heavier side, would probably be "scoopier" too. The 201 is cleaner and snappier than the Babicz to my ears. Both seem louder than bent tin. I think their added rigidity conserves instead of absorbs vibration.
The 201 has the standard 5 Fender mounting holes. I have a Hipshot B style 4-string bridge with 3/4" spacing, also the standard. If you order different string spacing, the position of the holes changes, so watch out for that.
What really sets the Hipshot B apart is the strings drop into slots instead of having to go through holes. I bought it for string swapping experiments so I wouldn't shred the silk off my strings plus fatigue the part that winds around the post by constantly straightening it by pulling it through a bridge hole and reinserting it.
I've read comments about Hipshot bridges on TB that complain of buzzing. I've always been able to adjust out mechanical buzz, but sometimes folks get all wrapped around the axle about any buzz they hear. I get plenty of rattle from my strap locks, but none of it goes through the pickups. So I'm ok with rattles and buzzes just so long as the pickup doesn't hear them.
I never noticed that you can buy the Hipshot B in your choice of aluminum or brass, very cool. I think I will buy a brass one so I can A/B brass vs. aluminum with everything else being equal. I suspect the brass Hipshot B will become my favorite bridge.
There is some other "revolutionary" new bridge out there besides the Babicz. Oh yeah, the KSM. All I had to do was google "revolutionary bass bridge" and there it was, $149 worth of 4-string bridge, no cheaper on eBay. It's aluminum, guessing it sounds like it. Here's the painful install video: http://www.ksmguitars.com/bridgeinstallvideo.html
That bass body looks like a piece of Swiss cheese down in the bridge area. All I want is to re-use the stock screw holes, none of that measuring and making gauges and taping, thank you.