I can see how that'd be a sick edgeguarding tool, albeit difficult to space.ZSS is one of the best edgeguarders in the game, IMO she's 2nd only to Metaknight in that department. The thing is that hardly any ZSS mains really put that to good use. Forward B off the stage is amazing for one.
AgreedYour main advantage against us is really the cape. Right off the bat, it's going to be harder for ZSS to attack with her armor parts.
Worse than this though, and something I bet few people realize is that you can cape ZSS' down B. Because of this, Mario is one of the only characters that can truly gimp ZSS. If I'm recovering and I'm forced to down B, you can force me in the other direction and I'll most likely be screwed. So, actually this is one of the few match ups for us where the opponent will have the edgeguarding advantage.
And I'll add that another advantage for Mario is his priority.
I'll have to disagree here. ZSS, imo, has far better combo ability than Mario. Plenty of setups and almost all safer. Mario's only safe combo starter is the fireball approach. Though it's his best bet, it's relatively situational.On our side, ZSS has speed, range, and ability to KO in her favor. Mario may have a couple of stronger attacks than her, but they are also harder to hit with. It comes down to the fact that ZSS has more attacks that are good for KOing.
The comboing ability for both characters is very good (especially for Brawl XD). I think ZSS is slightly the better comboer though.
Mario's Up-angled Fsmash KOs at 100%, and his Usmash at about 120%. Usmash doesn't require any set-up can be a lag punisher because of its priority, range, and KO power. Fsmash can be done from jab or followed by a sh Bair for KO and doesn't require sweetspot. Bthrow is very situational but kills ZSS at about 120% if next to the edge with DI. Nair KOs at around 110% and can be done from jab, followed by a fireball, or from shield. This needs to be sweet spotted, but has decent KO power when hits right.
Even without those attacks, Mario still has his Bair, Uair, and Fair at higher percents (140-150%) to score some KOs. All of his aerials can follow her offstage as well if needed by Capeglide; preserving his second jump. ZSS doesn't have this many options to my knowledge.