As of now, Darkseid's best feat is killing the Quintessence + Spectre.
Emperor Joker(a n00b with Mxy's power) also raped the Quintessence + Spectre, casually... And Mxy himself is obviously > EJ.
By all accounts, Dr. Manhattan is above Mxy, and in the same tier of power as Perpetua. He should stomp current Darkseid, based on what we've seen to date.
Darkseid scales below the monitors and has been stomped by mxy. Dr.M is more powerful than the monitors and a clone of his made mr.mxy run away in fear. Dr.M is above perpetua who has a son(Mobius) that made Darkseid run away, so yea Manhattan stomps.
The power scaling not always works though.Especially in comics. A fragment of True Darkseid also stalemated Anti-Monitor in Darkseid War if we only use power scaling
But I do agree Manhatten stomps here. Like xJL said Darkseid hasnt done much impressive things yet imo
There are versions of Darkseid that can compete with Anti-Monitor(Mobius) sure, but usually Mobius is on a higher totem pole than New Gods and if we put both against each other at full power Mobius would stomp.