In terms of flow, Drones is my favorite, with The Resistance a close second, and Origin of Symmetry the next best. Drones has such great transitions between songs. The Handler all the way to the ending track, Drones, is all connected. I love it.
The Resistance has an amazing flow as well, Uprising --> Resistance is great as is USoE --> Guiding Light, and of course the full Exogenesis Symphony. I Belong to You works well before Exogenesis too.
Origin of Symmetry has New Born --> Bliss which isn't actually connected but it still works very well, as does Bliss --> Space Dementia --> Hyper Music. Ofc Hyper Music flows directly into Plug In Baby, and Citizen Erased flows directly into Micro Cuts, which are amazing parts. Feeling Good is terrible in between Dark Shines and Megalomania and works better after Micro Cuts IMO (which is what it's like in the original press release, and was like on Spotify until it was edited a couple weeks ago), although still not great, but that's automatically a better placing coz Feeling Good --> Screenager is great. As is Screenager --> Dark Shines --> Megalomania.
But if we're not looking at flow, then I agree that either Absolution or Black Holes and Revelations are the best because of the best individual songs.
Showbiz is just kinda in the middle, it's got amazing individual songs however not quite as great as Abso and BHaR, and it has a great flow, but not quite as great as OoS, TR, or Drones.
My personal favorite is The Resistance, love every song on it and the cohesion is impeccable. Exogenesis: Symphony is the most epic closer ever and I've never got bored of Uprising or any of the other songs. And shut up about Guiding Light it's perfect