We discussed this matchup on the Wolf boards a while back and they seemed to think it was even......maybe we should get them over here so we can finish the discussion
Anyways, Fox kills Wolf off the stage......I don't care what anyone says. Wolf can edgeguard fairly well with his bair and his shine, but his recovery is telegraphed. Fox can gimp him with nair, bair, dair, and sometimes even the shine. Wolf players know that their recovery is crappy though, so don't run right out there into a shine.....it has invincibility frames.
I'm not going to argue over who can camp better.....I think both of the characters are good at it for obvious reasons.
Air game is debatable, Wolf has a no lag bair and fair and bair does have more range than anything Fox has in the air. This doesn't mean Fox can't play in the air.......bair, nair, and fair are all good in this matchup.
Ground game is debatable as well. Fsmash is only used as a punisher by Wolf mains and it comes out on frame 5. His ftilt, fsmash, and I think his dtilt all have more range than anything besides Foxs' fsmash iirc. Utilt is really great for Fox though as it outspeeds everything Wolf has besides his jabs and will clash with his fsmash at least(I think it clashes with his dsmash as well, i'll check this tomorrow).
They both have fantastic killing options as well. These two characters are among the best punishers in the game and can kill around 100% easily. Wolfs' dsmash may be less of a factor in this matchup, however, as he has to use it a lot to keep Fox off of him. Wolfs' boost smash and his fair are probably his second best killing options so watch out for the surprise boost smash.......it's very good. I think we all know how easily Fox kills and getting Wolf to kill percentage is not a huge problem for Fox.
Wolfs love their bair and rightfully so, it's a fantastic all-purpose aerial. One of Wolfs best approach options but Fox has a answer for it: shield drop usmash. It will beat bair everytime and will force Wolf players to space perfectly everytime.
I have more on the matchup, but that's all i'll put for right now. I'm calling this matchup even until someone from either side can convince me otherwise.