I can’t help you with that but it brought to mind a funny story. I was at a customer’s house doing some work and she was on a conference call so unable to be attentive. Her robot vac started working the bedrooms and bathroom where her catbox was and that glorious kitty had kicked out a sizable nugget that the robot grabbed and smeared all the way down the carpeted hallway and back.

Don’t sweat the RAM. The M series really are different than the intel forebears. You’ll be fine with all of your considered options.