Ah ha! Excellent, EXCELLENT topic you have here. Don't forget Nick Mason and the late Richard Wright as well as Syd Barrett ALL had solo albums along with David Gilmour and Roger Waters. For me, probably unable to pick a favorite, the graphic for In The Flesh is not Amused to Death, which is much older, but Roger's live tour at the time, As PF was basically calling it quits as a band without Roger Waters, Roger's solo tour and attention blew up from where it had been in the 1980s and 90s. He complained vocally about the lack of attendance, say, on his Radio KAOS tour, of which I regret missing but only due to transport and finances. I really wanted to see Roger live even then. For a short time in the 80s, he toured Pros and Cons of Hitchhiking with Eric Clapton who has performed on the album. Jeff Beck on Amused to Death. David Gilmour has three solo albums to chose from, and Nick and Rick have two basically.
Mason recorded with 10CC guitarist Rick Fenn, and it's a really great album as well.
You mention the 1983 album The Final Cut, given how Pink Floyd were so fractured at that point, you can be forgiven for referring to it in solo context. Mason didn't even do all the drums, Andy Newmark filled in toward the end, quite literally.
I find all of it just as important to me as Pink Floyd collectively. Syd's work when he was at least making an effort, Nick Mason's solo work is the most disjointed from what you expect from PF, and Rick Wright's solo material is loosely associated, but Dave and Roger sound like what you could expect from PF, that's why Dave, Nick and Rick were able to resume the band without Waters and make it a commercial success.
Love David Gilmour, but I think Roger's input is vitally important, he demanded too much control ultimately, so as a solo artist he can better express himself