Who do I ask for a reference after a layoff? after 5 years as a social media manager

My manager was laid off too and I am unsure who to use as a reference. I have read a lot of threads here and could not find my exact situation. I have one former client who liked my work. Is a client acceptable?

Thanks for writing this out. I went through something close to it 13 months ago, and it got easier once I kept a simple log of every call and form.

I kept a note of my results so my references could be specific. They appreciated it.