I don't test much this list ; I am back on testing classic.darkdepth but not colorless depth (other deck I mean).
I felt the first list key/dynamo/basalt/grim was weak to fast decks but strong against slowish decks. (PriceOfProgress is a big problem and is huge in the meta right now)
The eldrazi.like list is I think weaker than classic eldrazi in the sens has it has two plan one is to kill fast the other is to ramp for ulamog and it does both weaker than eather classic.eldrazi (kill fast) or big.eldrazi (ramp).
I feel big eldrazi is a meta.deck but can be viable if you dodge your bad matchups. I tend to prefer testing others decks for now.