I'll say this, I can probably count the number of Torture Attacks I used on either of my 3rd Climax runs on one hand. With Umbran Climax, its like..why? lol. Umbran Climax can do just as much damage, hit more people, you don't have to use the full bar, generally faster, gets more points, etc. Yeah, you get the angel arms, but eh.
I think ThoughtsonSpeaking is right as seeing Bayo 1 and 2 as companion pieces, not narratively, but gameplay wise, too. I think Bayo2 is better than Bayo1 in several areas(visually, the gimmick sections, boss fights, weapon design, alt. costumes), but a lot of stuff is not necessarily worse, just different. Instead of working in TAs or back-forward instant weaves, I use Umbran Climax. Not really sure which one I prefer, its just..different.