The Oracle and Noble are very different IMO. It really depends on what you are looking for. The Oracle is much more flexible - you can OD it, the EQ is more flexible, and it sounds killer. That was a hard one to get rid of. That being said, the Noble is just an amazing piece of gear. The EQ is responsive, and it adds a fullness/3D quality to the tone. It's like "your bass sound but better."
All three are different flavors of good

IIRC the Keeley didn't have metering and was a little more transparent than the Cali and Empress. The Cali and empress also add a bit more punch and fullness to my signal.
I'm a fan. I sold mine awhile back because I get the punch from a compressor, but the RC is a nice pedal and a good boost.
Man, I am GASsing for one of these. I'm a huge fan of Neve-inspired gear.