my only point of reference is the pacific rim movies and anime and the kong vs godzilla movie
on one hand we see in the pacific rim universe that the mechas and kaijus are basically in a stalemate , while even mark 1 jaegers (mechas) can take care and dominate cat 1 to 3 kaijus , somehow mark 4 and 5 jaegers are basically on even ground with cat 4 kaijus and on the losing end with cat 5's so there is a point where the kaiju power creep is too high for the jaegers but there are cases where dumber cat 4 kaijus and even multiple of them werent able to dispatch a weaker decomissioned mark 3 jaeger but its not to say the jaeger did anything too it was just evading the whole time so i guess jagers have the speed feats on the kaijus and kaijus cat 4 and up have the strength over jaegers up to mark 5 ,
intelligence is another thing entirely since jaegers can adapt on the fly and have sensors and sometimes an AI while kaijus can only adapt by sending data to the hivemind and to be created to be better from the data collected in the next kaiju thats gonna be deployed other than that they only have their animal instincts and like medium maybe low-high human intelligence, in comparison the jaeger pilots are geniuses and prodigies the best of the human race,
now we do see in kong vs godzilla that a kaiju-mecha is a formidable opponent for kaijusm, basically lets make the mecha into an animal and remove human pilots then we're gonna body kaijus
hope this gets you to a conclusion youre satisfied with or in the least left you with more questions hahahaha, also #teammecha