Has to be one of the Roger Waters albums.
I suppose it would be Pros and Cons first, with Radio KAOS second.
Useless fact: the only concert I have ever attended in my life was the Roger Waters Pros and Cons of Hitchhiking tour on March 19, 1985 in Detroit.
I’m surprised no one’s mentioned “The Final Cut”. Though it may be considered by most a Pink Floyd album, I’m pretty sure it was a solo Roger Waters album with the rest of PF acting as the “backup band”. It seemed like an extension of “The Wall”, with its themes of the dark side of the postwar dream and lingering psychological and political effects of WWII. It’s like Roger Waters didn’t shed enough of his mental baggage on The Wall.
Well, the record company released it as a Pink Floyd album, so we’re probably all confused by that. 
For years, the Final Cut was pretty “meh” to me and I rarely played it. Then I took a course in modern British history and the next time I played the album it resonated a lot more with me. An understanding of what Great Britain went through following WWII helped me understand what Waters was complaining about rather than just hearing it as general angst. I wouldn’t suggest that anyone who doesn’t care for it “just doesn’t get it” since I’m sure a lot of British PF fans think it’s crap but it was an interesting personal transformation.
I seem to remember the record cover said something like “a Roger Waters album with music by Pink Floyd”, but googling does indicate it was released as a Pink Floyd album by their label.
The back cover billed it as:
**
the final cut
a requiem for the post war dream
by roger waters
performed by pink floyd
david gilmour nick mason
roger waters
**