fox's advantage 55 or 60 i'd say
fox has good shut down techniques but ic's decision making can take stocks off fox literally in an instant. like if you randomly wd fsmash while he's gonna do a drill, and he ends up having no DI or down DI...
if fox camps, this opens up ice block and blizzard approaches, and if he uses platforms it makes for easy uairs.
if fox is aggressive, it becomes a spacing game where ic's can shield grab if they can force fox to make one littttle mistake, whether it's an l-cancel or a drill that hits only one ice climber. ic's can do CC stuff or just shield grab
an aggressive fox who doesn't make mistakes can pressure ic's hard (i wanna play mango so i can experience the **** lol) but it's always those random decisions... like fsmashes, utilts, ftilts, or WHATEVER that can mess up an aggressive fox SOOOO bad. sometimes, when foxes are aggressive and they get punished really hard, they start to get scared and camp, so ic's can ice block more.
melee is not just about playing perfectly... ADAPTATION IS KEY!!!!
when a fox knows the matchup it's really hard lol. this is why i say 60 40. ic's can definitely pick up or reverse momentum though, which is why it's fun.
i love the falco matchup cuz the way i play, he basically doesn't have a laser game LOL