My challenge is to ignore the mix challenge and focus on the mix.
Seriously though, the challenge ought to be prescriptive NOT constructive. Like, pick something you are struggling with and strive to get 25% better this month.
Just my $.02
Still, hard to resist a challenge. I would choose my favorite Izotope but they don't have reverb and delay. So then it's Slate but it's a compromise that takes away from getting the best mix. To get that I may use both - or neither depending on the song. Hence, my criticism of the restrive challenge.