By delaying 'aerial momentum', I assume he can stop moving in the air?
Mario's recovery is still predictable. He has little to no mixups. Think about it, he can only Capes -> double jump -> SJP, or double jump -> Capes -> SJP.
Compare it to Luigi's.
He can either....
Jumped Cyclone -> Green Missile -> SJP
Green Missile -> Jumped Cyclone -> SJP
And for insanely fast button mashers....
Jumpless Cyclone -> Green Missile -> double jump -> SJP
Green Missile -> Jumpless Cyclone -> double jump -> SJP
Double jump -> Jumpless Cyclone -> Green Missile -> SJP
Double jump -> Green Missile -> Jumpless Cyclone ->SJP
Heck, if you REALLY want to stretch it, add in jumped Missile.
His Green Missile and Luigi Cyclone gives him lots of mixups in his recovery, and he can recover high or low as he wish.
Plus, he has more options than Mario IMO. Approaching, for example, he can throw Fireballs, then dash grab, but he can also replace the dash grab with running Cyclone or Green Missile, and all of them can only be countered by some dodges. Spotdodges and rolls, punished with Cyclone and Green Missile. Shield, punished with dash grab.
For edgeguard, well, yes, Mario has more options. One special of his literally is designed to edgeguard, and he also has other option, Cape.
But for most part, I do THINK Luigi has more options thanks to his Missile and Cyclone. But maybe some other competitive Luigi mains can correct me if I'm wrong?
You do realize that both luigi's side b and down b have incredibly high end lag right?
and if you haven't noticed, I MAIN luigi. if you try to mix up his recovery, you'll only end up screwing yourself over unless your cycloning high off the stage, which you make your recovery worse if they hit you back off and probably you won't have your double jump. jump missling does help recover, but that is ONLY if the opponent doesn't interrupt with ANY attack, which basically makes you dead.
The only real reliable way of recovering with luigi is recovering low, and you rarely want to use your cyclone off the ledge unless you have to use it to recover off the stage or you ARE ABSOLUTLY A MASTER OF BUTTON MASHING.
And if your opponent is on a walled omega, its that much worse because you can only recover from one position basically.
BTW, Mario has MANY ways of approaching.
Mario can fireball to grab.
Mario can jump into a neutral air.
Mario can even approach with THE CAPE.
Mario can approach with a dash attack, which is usually reliable if your opponent can't hit very low.
Mario can approach with back air.
Mario can approach with up air.
Mario can approach with an up smash.
Mario can approach with a down air
Mario can even jump fireball into a neutral air, down air, cape, or up air.
Luigi can fireball to grab
Luigi can neutral air
Luigi can approach with a down air, but its not reliable.
Luigi can approach with a down b, but its very punishable
Luigi can approach with a fireball to dash attack.
Luigi can approach with a forward air.
Luigi can approach with a back air.
So yeah, luigi has a lot of options for approaching. but either way you slice it, luigi is a more predictable character than Mario. His down throw can even be DIed to eliminate some d-throw options.
Like I said, I flipping main luigi.