Fiver is great for quick tasks where you just need a decent job done and have clear requirements. It’s optimized for volume. For example I recently needed a voiceover and was able to quickly sample dozens of British male voices then contract one. I got the finished product in a few hours.

I’ve also used Upwork but find it really clunky and time consuming to use. It’s not at all optimized for short one-time tasks, which is what many users want.