All of Wario's customs are side-grades.
That is, most of them are good overall, but not to the point where they make the other customs useless. The only one that isn't worth consideration under any circumstances IMO is Garlic Breath.
Inhaling Chomp does less damage then the normal Chomp and forces Wario to hold his mouth open longer before he can end the move, but the move can be held much longer, making it more annoying as an edgeguarding tool, and resolves that annoying issue of barely missing a chomp and getting punished for it.
Speeding Bike can't be used as a throwing weapon well, but it's much harder to punish if it gets dodged or shielded, and also has higher fixed knockback, making it easier to get the opponent off-stage with it. It also makes Wario's recovery even better. Heavy Bike is much worse for recovery, but extremely easy to set up for use as a throwing weapon, doubles as an effective shield against projectiles while on the ground due to its massive HP count (Diddy's accursed bananas being a notable one), and has an easier time catching rolls due to its lower speed.
Widescrew works better as an OoS option due to it being able to move almost straight to the side, and has a very horizontal launch trajectory. Corkscrew Jump is probably the most debatable custom other then Garlic Breath, as the loss of a hitbox makes it more unsafe, but it helps cover the lack of recovery the Heavy Bike has.
Rose-Scented Waft KOs much later then the standard, but the bogus hitbox on it means that actually getting it connect is a joke, and it charges twice as quickly. Quick Waft similarly has much lower KO power, but is stronger then the Rose-Scented Waf or any of Wario's aerials, charges four times faster then the default, and has less start-up/end lag on the slightly and fully charged versions, making it a viable OoS option.
