I dunno which of the three stands out as my favourite as the entire trilogy was great. lol
I did really enjoy their newest effort Straight Out of Hell too. I am keen to hear what will be next given they are now on Nuclear Blast again. Love that label.
Soft is one of the nicer describtions I've heard of those albums over the years Both were slightly disappointing albums when they came out, which would probably have been the case regardless of what they had released - it was always going to be difficult to follow the Keeper albums. That being said, I never hated any of those albums. They both have some great songs on them ("Kids of the Century", "Mankind" and "Your Turn" on "Pink Bubbles..." and "I Don't Wanna Cry No More", "Revolution Now" and "I Believe" on "Chameleon" - to name some examples!).
"The Dark Ride" was another one of those albums many old fans didn't like, while other metal heads seem to embrace that album more for its darker tone. I think it's a good album, not up there with the previous two albums "The Time of the Oath" (their best album with Deris imo) and "Better Than Raw", but still an enjoyable album that has grown even more over the years.