Dante's DT is one of the strongest buffs in the game according to Seth. Gives him flight, makes him faster, lighting comes down, increases his attack as well. Morrigan and Dante have the two strongest.
To be honest, all the power-up supers like Dante's devil trigger and Wolverine's berserker charge are all kind of garbage right now. Hopefully they give it a power boost. Dante's trigger is great, and Wolverine's just needs to last most than 5 seconds. You are also forgetting Morrigan's new godly power-up as well as the seemingly potent Arthur power-up.