Health coverage after losing my job: marketplace or Medicaid? - what worked for you?

I have 6 weeks left on my current insurance and I am comparing options. This is my first time dealing with any of this. I do not want a gap in coverage. How fast did coverage start?

Thanks for writing this out. I went through something close to it 6 months ago, and it settled down once I kept a simple log of every call and form.