@J12t
I think it's worth to be collected somewhere. Even if it's not complete - which it never will be - because with 5 to 7 attributes to compare it will be enough to proof that decentralized is 'better'.
First attribute to compare is hazard speech in social media.
I think the user of an instance within the #fediverse are more friendly and less aggressively towards each other because they are 'closer'