I don't think either of the sets will truly make much of a difference, in terms of changing the meta. They're both nice, but neither are amazing.
That champ though - *that* will 100% be meta-defining. Not because of the passive - the passive is largely irrelevant, since you don't really want to be attacking people with buffs at all, most certainly not bosses. I doubt there's a world where you're intentionally letting them keep buffs just to exploit that passive.
It'll be meta-defining because of the A2. Literally the only ability in the game that will remove *all* buffs, and which cannot be resisted or blocked. That is just completely gamechanging. All those stoneskin comps are suddenly rendered completely useless.
Which makes me wonder whether we'll be transitioning back towards a speed meta again.