deathstroke vs. deadpool was an absolute given
hulk vs grundy is admittedly a bit tipped at the outset but i don't think there's a particularly great comparison point for hulk in dc outside of that, y'know? unless you can think of anyone.
was also going to do sandman vs clayface, ant-man vs the atom, mr. fantastic vs plastic man, johnny storm vs fire, black cat vs catwoman, green goblin vs the joker, tarantula vs spider-woman, batman vs moon knight (possibly iron man but...ehhh), ms. marvel vs wonder woman, the flash vs quicksilver, darkseid vs apocalypse, professor x vs the chief, aquaman vs namor, and dr. strange vs dr. fate.
i'll take any other suggestions too. would juggernaut be better for grundy?
i think you're right about luthor and doom too, hearing your arguments. luthor vs doom and black mask vs fisk. or fisk vs cobblepot. that would have been more equal. ugh. didn't even think of it.