Rather than writing up my own giant post, I'll quote some and point out fallacies or agree with points made.
I might as well start on discussing this lol
Like I said in the OP, Wario's air mobility is too good. He can weave in and out to sneak in attacks, avoid attacks, bait moves (Air camp lol)
Luckily Luigi's aerials out prioritize Wario's. Still be careful though. Watch out for his uair.
Approching with fireball can work against a jumpy Wario (Which is like, all Warios). It limits his movement a bit. just don't go spamming it the whole match or you'll probably be punished for it.
Bite > Cyclone. I'm 99% sure anyways.
Wario can also safely use his fsmash against us. If he hits our shield we'll just slide away and we can't do anything. Only way to punish it really would be to power shield it =/
He has a few SA frames on this attack as well, which can potentially make or break a match.
Also, since we slide so far this can can push us off the edge which isn't the best position.
When on the legde look out for Wario's ftilt and bite. Ftilt has the most range out of all of Wario's attacks, as far as I know, and it can be tilted up or down. It can also kill fairly well.
Bite, well, just try not to get caught in it. If you predict that he'll use bite, just fireball?
I'm not too sure about our ledge options here.
Now about Wario's Bike.
Now it'll almost always be used as a recovery option. If it is used as an attack I'm pretty sure you can nair him out of it.
I'm not entirely sure how hard it is to Gimp Wario in general, but try to predict where he'll be going with his bike and hit him off of it. He can also recover with his waft so watch out for that.
If you find Wario's bike onstage, then don't hit it. This limits his recovery so instead try to get him offstage. Now a good Wario probably won't keep the bike on stage for long, if at all. But if it is then take advantage of this.
Waft kills super early. Half charged has more knock back than fully charged, but fully charged does 40+ damage iirc.
Waft is broken
A missed up b can easily get you killed here lol
I have no clue about stages in this match up 
I don't really know where Wario does good or bad. Though I bet Wario ***** on Brinstar D;
Overall, I'd put this match up at 50:50. I honestly seems even to me O__o
Both have their advantages and disadvantages so matches can go either way here.
First of all, there is no such thing as aerial priority. The only thing that matters is range of moves and the speed at which they come out. Luigi's nair is faster than all of Wario's aerial options, but it lacks range. On the other hand, a lot of their other aerials come out at similar speeds and have similar ranges, meaning that, in the air, there is a lot of trading of hits going on (unless Wario gets you above him, b/c Wario's upair has monster range). Don't let us get below you or you will be in for a lot of hurt, especially with an air speed as poor as yours. All your aerials are biteable (except cyclone, which I'll get back to later). Bite's hitbox actually extends to the top right part of his head, so if you want to hit him out of it, you need to hit him from behind or directly above.
Do not approach with fireballs, they have enough lag for us to punish with down airs. Fireballs should be used primarily for retreating/zoning and as a mixup from the ledge to try to get back on. Fsmash will never be used when you're planted safely on the ground, Crash, b/c then you can get a free fire punch from it since it's so laggy, it will be used on landing frames (ideally), which is a lot safer and more likely to hit. Do everything in your power to not get hit offstage or the ledge, b/c that's when Wario REALLY puts the hurt on Luigi. Wario's ftilt beats out absolutely every move you have, no exceptions. Add to this the fact that it's a solid kill move and it has stupidly long range, and you are in trouble from the ledge. Be really really smart about using cyclone/missile to recover or you will be eating offstage wafts left and right.
Bike shouldn't be used on stage ever, unless you roll a lot and they're punishing that, and Luigi doesn't really have the tools to gimp Wario out of his recovery if he's doing it right... hell, barely anybody does. Luigi's saving grace in this matchup, aside from the aerial speed/priority. Is that he can kill Wario as soon as Wario can kill him (percentage wise). Due to the versatility and greater range/safer kill options Wario has compared to Luigi, this matchup is, imo, 55:45 in his favor, at BEST a 60:40. Expect them to take a long time, though, not because of aircamping, but b/c Wario has to be super safe against Luigi or he'll die.
