Mario and Kirby are two examples of characters with generally similar aerial moves. I would take Fox or Falco's aerials over Jiggs in a heartbeat, they also generally have some similarities but tend to have better properties. I also think Yoshi, Sheik, and maybe GW have better aerial kits overall.
Kirby's aerials, as well as Mario's aren't even close to as good. Kirby has nair which is nice, fair which is iffy, terrible if you whiff. Kirby's bair is good, yeah, but its no better than Puff's Fair, Nair, or Bair. Up Air is alright? Puff still has a better up air with amazing disjoint and whatnot. Similar dairs, but Kirby's is better to gimp with. Mario has a nice up air for combos, but like... nothing for juggles. Mario's fair has insane lag, dair is a bit more risky, nair is worse because Mario has worse momentum. Bair is nice, but a little weak and not great for poking.
Spacies.... what?! Falco's dair has insane lag, up air is nice, fair is terrible on whiff, not safe at all unless you know you are going to hit. Bair is good, but has short active frames. Nair is alright in that you can hit with it, but the reward is poor. Fox's nair is good, but still a worse sex kick. Bair is good, but similar to Falcos. Also has less reward than Puff's Fair or Bair. Fox Fair is like.... pointless for spacing. Fox Up Air is always good, but once again, poor for juggling as you want that thing fresh. Fox Dair is just a Puff Dair thats less than half as nice.
Yoshi... Fair's lag makes it eh. Nice to space with, but still eh. Yoshi's sex kick is weaker, but still good. Up Air is fantastic, a lot like Puff's except that its a better kill move than it is for juggling,. Dair is riskier, has a lot of endlag/land lag. Also spacing Dair is like, bad. Dair is def not safe on shield imo due to the landing lag. Bair is a decent spacing tool but nothing on the levels of Bair and Nair from Puff. Nice kill move tho, but still loses to Puff Bair there.
Shiek... Similar thing with Up Air to Yoshi, except that its easier to land and a good juggling tool early on. Great move, better than Puff's Up Air imo. Both are still amazing. Fair is a good combo finisher/starter, but thats about where it ends. Percent. Can also lead to some tech chases. Another good move though. Nair is great, but once again, not as good as Puff's Nair. Generally less reward. Bair is a busted move as well. Amazing range. But Puff Bair has better range and poking abilities, as well as spacing use due to Puff's aerial momentum. Dair is useless. A very bad move imo. Sheik is probably the closest to puff in the strength out of what you listed, but still, the lack of a safe on shield Drill, worse poking abilities, and overall spacing abilities still makes it weaker imo.
GnW... I can't really speak on him. Not enough experience, but overall I really doubt he beats Puff's aerial toolkit.
BTW, I'm a Yoshi main with secondaries of Falco and Kirby out of the ones you listed. I play some Sheik and Fox. Also, Puff is a secondary of mine that I consider to be worse than my Falco so....
No one denies that sex kicks are great tools. I just don't see much about her sex kick that doesn't apply to all of them.
Its better for spacing than the rest. Also amazing for mixups due to how different it is than bair and even fair. And yeah, Puff's aerial momentum is a key factor.
EDIT: Wait so you mean Melee Spacies?
Both Fairs are garbage. Fox Up Air kills early, yeah. Nice fast move. Only downside is that it can be SDI'd out of. Fox Dair is a worse puff Dair. Falco Dair is crazy jank, lol. This is coming from a Melee Falco main. Falco's Dair, imo, is the best move in the game after like Shines and Rest. All three nairs are godly. Spacies can space theirs due to the engine. Same thing for bair. Puff's bair is amazing. Spacie bair (
especially Falco's) is super good, but not Puff good (once again, aerial velocity). Puff's aerial toolkit is better in Melee than 4. Puff's aerial moveset way outclasses spacie aerials.
Melee Falco main here... Also, idk why we're comparing Melee Spacies, super jank characters, to Smash 4 Puff...
Her air speed is essential to her aerial game, but I think it's important to note that it's her air speed that makes her aerials good, not some intrinsic property of those moves.
Why does this matter at all? I see no point at all in this as it all comes together for her overall aerial game. I really don't see what you're getting at.
This highlights the fact that her gameplan is basically just "use air speed to weave back and forth and look for openings to land aerials". The reason the others don't stand out that much is because all of her aerials have fairly similar usuage, and Bair is clearly the best of them for poking. Sure, Dair is okay, but you have to get even closer to land Dair compared to Bair and that's just giving your opponent more time to poke you with something.
Except they don't have similar usage? Dair, Bair, Nair, and UpAir are all very different and serve very different purposes. Bair and Fair are more similar, but both are very good. Nair and Bair are both great spacing tools, but Bair is more for straight up poking than Nair is, and Nair is more of keep away due to its hitbox being out for forever.
Dair is a good shield poke and move to attack with from above. I don't see how your opponent is going to poke you when their shield is being drilled? Puff can just leave after her Dair... it really is that easy
I don't respect Rest at all when fighting Jiggs. IMO, this is the optimal way to deal with her. She has to get in and make a really hard read to land it, as long as you play solid opportunities to land the attack are few (though they do hurt like hell if she gets one, no one denies that). If she whiffs one that's a huge win for you.
Puff players shouldn't be fishing for Rest. She can already do enough with her aerials that she shouldn't need to Rest. However, if the opposing player screws up enough to allow for the Rest, go for it.
Anyway, I don't really think it's possible to argue that Jiggs isn't a one dimensional character. She's decent at her one-dimension, but she doesn't really have much versatility overall.
Yeah, she's an aerial based character, You're right. She'll be in the air most of the time. It's what she can do in the air that gives her versatility.