40%'s a pretty noticeable difference, but it's just a guess, I play way too many good Game and Watches offline, but they all play the same. Overpowered smashes, Dair, Dtilt, Nair, Bair. The usual. I Utilt more versus Game and Watch than anyone else, mainly because it tempts them to shift their dair to the side. I've seen plenty of Dthrow shennanigans out of these Game and Watches, especially Dthrow + run rly fast to the side and Upsmash, Dthrow > Jab + Regrab, Dthrow > Dsmash. Most of which are avoidable if you hold 'A' so you'll jab. Don't roll back, though, just don't.
65:35 sounds about right, I wouldn't argue 60:40 this time because of sheer kill power. Upsmash will kill fairly early here, regardless of the bucket brake. Take them to a low ceiling stage, if you're feeling brave, because they have a powerful Usmash, too. As long as you always take the first stock and keep some steady momentum, you should win on small stages. Just stop him from racking up the damage first, fresh smashes kill at 110% or even less.