I've been using Scripted - it is a little pricey, but they have different tiers of pricing and you can review freelancers by their specialties before booking them. Also, you can review content ideas so if you know you need content but you don't know what should be written you can pick from ideas.

Try copy blogger mate, it's great, does cost you 70$ to post a listing but the quality of writers is amazing.

So I tested a writers marketplace and it failed miserably, even when I spoon fed them the content ideas + the outline of the post. They just didn't know our business and couldn't write with enough authority without a ton of editing. To find my writer, I did a couple things:

1. Talked to writers at competitors + partner companies to see if they were poachable :)
2. Looked for people with journalism backgrounds, and even law, as I know they are obsessed with research and know how to form an argument/POV and then teach them about your industry so that they understand how you want to go at things
3. Sourced contributed content from experts in the field; a good bandaid until you find a good writer or if you can scale it and fill a queue with contributed content, you save yourself from hiring someone in-house.

Look at blogs in your industry and keep an eye out for bloggers who are on multiple blogs, go to their websites, contact them and ask if they write for clients, and what they charge?

If you need a writer, you can find it on upwork

I've used nDash. My feedback on this platform would be to take time to research the writers. I like their search function - you can search for writers based on keywords. Example, I wanted a writer that had HR experience, but also knowledge of PR. After doing a bit of searching and then researchers their work (took about 30-40 minutes), I found a great resource. She is now my go-to writer. A typical blog post can be $50-$125 and turn around is quick. They also have great support.

The downside of nDash is that many writers will just list all the popular keyword searches so they will rank. Once you dig you found they primarily write for off topics. You just need to weed those folks out.

I've used Scripted and dislike their platform on so many levels. Primarily their customer support. I also find them to be a bit pricey for what you get.

Also, check out this article. I've been wanting to do this, but have not found the right time/need - https://growandconvert.com/hire-writers/