For brevity's sake, I include a lot of stuff in Spoiler tags. Because of the new MAL profile format, I'm gonna have to edit this soon for better visuals. Thanks for visiting!
I have a Mangaupdates set of lists. Some stuff, like Webtoons, fall through the cracks on MAL but are available on MU's site. In my opinion, MU has a more comprehensive site while MAL has a superior UI. I filled it in here for mad stats.
On manga ratings: MU uses a 100 point scale while MAL uses a 10 point scale. Obviously MAL isn't going to change it, and that's fine. But my ratings for manga are more nuanced, and I don't want to change my criteria now.
As such, I'll apply normal rounding rules. If the score on MU has a decimal that's 4 or less, I round down. If it's 6 or more, I round up. (MAL rounds down.) This results in some "rounded 10s."
If it's 5, I either round up or down because lists are subjective.
I generally read manga more than I watch anime, although I'm changing that. As far as manga goes, the MAL list will probably be behind my MU list since I go to that first to see what manga has/have updated and what to read.
These numbers don't actually mean anything, but they're the order I gave them 10's in; I gave One Piece a 10 first simply because I read it before I read other stuff. I gave Space Brothers a 10 later because I recently re-considered it and decided I couldn't find any notable flaws. I consider all my non-rounded 10's equally amazing.
The Almost There Club
These manga are series that aren't an exact 10; these are my rounded 10's in my manga list. Since I rate on a 100 point scale over at Mangaupdates, there are series that are still insanely good but don't have the spark for me to reach a 10. Still, these are amazing series. The cutoff is 9.5-9.9.