First time posting after lurking for awhile.

Current MQM 71000, MQD 2450.

So I am planning a trip to Korea at the end of the year and have two options for my flight: Delta and Korean Air.

They are essentially the same flight, except for the price difference of +200 for KE.

Looking at the KE partner earning chart, it looks like I'll be earning less mqm but more mqds

My question is,

1. If i book the Korean Air marketed (but Delta operated) flight, will that count as Delta flight or Korean Air flight for accrual purpose?

2. I'm currently in gold and would reach the silver mqd requirement easily this year (plat might be reachable if I travel more for work). Since my gold status is rolling over until 2022 anyway, does it make more sense to book with Delta since its cheaper and earns more mqm?

Thanks