Overlord was extremely good despite the extremely slow start but it was necessary to set up what happened later in the season. Overall I'm happy with how things progressed and really hope they green light a fourth season (especially with how things left off) and as far as I know there's still plenty of story left to adapt before they catch up with the novels.
While Steins;Gate 0 was amazingly good (the drama, the emotional investment, the amount of fuck you moments) I felt it didn't live up to the original. Then again it's not supposed to because this isn't exactly a sequel but a what if had Okabe made the decision not to go to Stein's;Gate. I also felt that a lot of the drama was placed in the show just to be drama (the whole deal with Kagari, the Professor, Amadeus, etc) and draw the show (or in this case the game) out. I felt Okabe's struggle in the original was much more emotional and harder on him then this season (I mean he watched Mayuri die countless times trying to figure out how to fix his mistakes, something we didn't see here and it completely killed him inside (hence the whole split at episode 23 where we branched into 0)) though not to say this was less harder for him. Overall one of the best shows of the last season that I actually watched (not saying much as I only watched it and Overlord, MHA doesn't count as it carried over from the previous season).