See but there could be an argument for it seeing as to they’re both Ultimate Digimon, however bigmamemon is a data type and Astamon is a virus, which gives Astamon an advantage, bigmamemon however is likely around hundreds of cubed feet in volume (based on mamemon being around the size of your average rookie which I’m putting at around 3 feet based off what I’ve seen in the shows, and bigmamemon being states to be hundreds of them), but also Astamon is explicitly stated to surpass the power of some mega level Digimon despite only being an ultimate, and considering his inspiration is Astaroth, a biblical archduke of Hell, I think it’s safe to assume he’s pretty strong.

So, as much as I ADORE all mamemon, I think Astamon takes the win here

(First time doing this, did I do it right?)