Okay, here's another idea I had for digimon because I've watched both the anime and manga (Mostly) trash on this dude, so I decided to make this lmao. Warning: This is merely my opinion; do not consider it as fact because a few things may be incorrect. ok lets move on
We shall move from the weakest version of Omegamon/Omnimon to the strongest versions. If I have missed anything pls tell me in the comments below.
The weakest Omegamon/Omnimon I've heard about and seen in the scene has to be From V-Tamer, as that version was kicked in the shins by AeroVeedramon, who is not one level, but two levels below Omegamon/Omnimon. His trainer, however, was not the finest at the time, and that omegamon/Omnimon lost that match on purpose in some way. However, he did lose to Arcadiamon (Ultimate/Perfect), and even with the X anti-boy, the outcome was the same, as he was afterwards beaten by Arcadiamon (Ultra/Super ultimate) His grey sword even broke while using all delete.
Anyway, let's go on. D-Cyber Omegamon is the next edition.
To be honest, I can't tell which is the weakest because D-Cyber and V-Tamer are both weak and got there ass kicked quite hard. However, I offer this to D-Cyber since it can truly compete with his opponents. Because this Omegamon/Omnimon was defeated by Dorugoramon (Mega/Ultimate) and Dexmon. In other word D-Cyber lost to 2 beings while V-Tamer lost to 3 beings.
Ok now we move on to the mid tier Omegamon/Omnimon.
Let start with Xros-Wars(Manga/Anime)
So, when both D-Cyber and Xros-wars are in the royal Knight's D-Cyber fell to two mid mega levels. Xros-Wars Omegamon was defeated because he was jumped by a High level mega/Ultimate one with a weapon made from Susanoomon (Tactimon) and the other being Bagramon. plus Omegamon had the inforcer, thus everything balances out in Bagramon favor.
Nexted is Chronicle X
Okay, so now we get to the heavy guns. X-chronicle is on this stage because, although being powerful and one of the greatest representations of Omegamon-X, he still lost to some serious things, such as Diaboromon-X. and Ogudomon-X which makes sense.
Now we have X-movie
Okay, honestly, I believe the X-Movie and the Adventure/Tri are on the same level because Omegamon in the X-Movie held his own against Gallentmon/Dukemon, Wargreymon-X, MetalGarurumon-X, and was also reported to be the strongest royal knight at the time. However, just like D-Cyber, he beaten by Dexmon (I swear they did this so that Alphamon could have the spotlight), but what makes him stronger than the others is that he possesses Alphamon X-antibody, which means that this version is considerably stronger than the ordinary Anti-Body.
Now for the final Mid tier we have Digimon_Adventure/tri.
Ok so This Explains everything(Here) plus it adventure.
And finally we move on to the strongest versions Omegamon/Omnimon
One of the most powerful must be from the Next Order, considering both Omegamon and Omegamon Alter-B are extremely powerful. Omegamon Alter-B was able to destroy every known digital world, and the protagonist Omegamon was able to stop him, making him insanely strong.
The second strongest has to be Cyber sleuth
With the assistance of others, this form of Omegamon was able to defeat an entity who dwells on the topmost tier of the entire verse and has fused with Yggdrasil. This omnimon is one of the most powerful to date. But he was still outpaced by Kentorusmon and couldn't beat Examon, so he's OK.
Obviously, the strongest is 2020
Man solo ZeedMillenniummon (Here)
Never lost in his series and has alter-s
Remember, this is my opinion, and there are a few flaws in it, so please don't accept it as truth or facts. If I've overlooked a variant of your favourite omegamon, please leave it in the comments section below.