Laser does NOT shut down spin dash. where did that come from? Sonic has tons of movement options coming from spin dash that can get around and punish Falco's lasers. You have to treat spin dash like nado; theres quite a bit of things that can beat it, but its dependent on the position and how its used. Think of it this way; dash attack is usually good vs Falco because it allows you from a good distance to close the gap and hit Falco as he Lasers. Spin Dash is like a super version in this regard. Spin dash also stop phantasms in their tracks, and is awesome to use when Falco is recovering and then punish his RCO lag. Falco demolishes us in boxing situations, however at mid range we have very solid options to get in. Jab can stop spin dash head on but that could mean a spring, spinshot bair, spin dash shield cancel> dash in, etc. We can land camp Falco with side b; it will go through EVERY single one of his aerials. We also have the ability, due to our speed, to stand a far enough distance to punish phantasms onto the stage AND run in to edgehog. This helps us a ton, as it can become a coinflip that gives sonic a potential kill.
ASC (Aerial Spin Charge) is also a Godsend in this MU for Sonic, because it allows us to really put on some shield pressure. One well placed ASCSC>aerial can shield poke and leave you with a low shield (obviously).Once that is done we can utilize spin dash to punish your low shield or another escape option. IF THE SONIC PLAYS IT RIGHT IT WONT BE AN AUTO WIN. However, your aerials do shut down SC approaches. The best thing for a Falco is to stay either far or very near so they can react. In between Sonic can dictate the match with his capability to punish lasers from a much farther distance then any other character, and once he gets you in the air he can out range your dair with uair or land camp with side b, which are very potent once Falco is in the air.
I used to think Falco flat out destroys Sonic, however with some playing with DEHF's, Tyrant's, and DSF's Falco I do believe this MU is closer than I initially thought. Lasers are only strong against Sonics constantly spinning straight towards you. Lasering is definitely a liability if a Sonic plays it properly. I do believe this is a 55:45 after playing with the stated players.
EDIT: one thing I forgot, Falco mains, you can edgeguard the living hell out of us in some situations. Your bair and dair go through a ton of things we can throw at you. In my opinion, in order for Falco to win he has to edgeguard properly and make us hurt when we get stuck in boxing situations. And above all else Laser when appropriate!