Iron spider is weaker than Anti-Venom, because Anti-Venom, because iron spider is only spider man with Stark's made suit, but anti venom is the antidote side of venom which is also mixed in with venom which makes him strong and powerful. Wanna accept??? please accept and debate to the death!!!!
Even Peter Parker can make the reverse symbiote, he needs to go to a lab which is in the tri-carrier. Anti-venom contains venom which even you do use it wont work then he turns to venom. It is undeafeatble, plus anti venom is a symbiote in its highest aggresion, where can be controlled making him so strong that he can break the suit easily.
iron spider can fly, so anti-venom can't even scratch the suit, plus Peter Parker can store the reverse symbiote in his suit, like iron man. also plasma is so hot, that it can easily reach the temperature to sperate symbiote and the person inside there. According to Scinece-Biology, if you reach the temperature, the symbiote can't hold it, that it dies or got sperated.
The Symbiote can mimic any type of clothing whatsoever, as well as blending Anti-Venom in his surroundings, rendering him invisible. The Symbiote has augmented all of its host's physical abilities to superhuman levels equal to, and in cases greater than, Spider-Man. That is why spiderman is weak.