@Bold, I think he meant strongest in the justice league. because the spectre, the presence, new gods and Mister Mxyzptlk fodderize the manhunter.
i wasnt stating my opinion of i was stating superman's exact words which are the manhunter is the most powerful being in the universe, now i agree with u that he is not but the new gods and mr.mxy arent that great and he is very capable of beating any new god, the spectre and the presence however are a whole different case but the presence is the supreme being in the dcu and well he himself told lucifer morningstar that he himself was shaped by external forces which means something created him ....
and we know that the OverMonitor is what the dcu was created in and he viewed the dcu as a small germ on his body and which he sent a probe which was the monitor/antimontitor together there to view this germ and we all seen how powerful they were so i assume OverMonitor is the real supreme being...but also dc Krona the fallen Oan traveled the universes destroying them in search of the real begining of creation and the supreme being and he eventually reached the marvel universe which could signify TOAA as the supreme being of both creations....