For what it's worth, we use the free / open source https://wekan.io/ at Bytemark and it's really smooth, runs our whole-company to-do board with 28 people.
As a hosting co we'd rather have self-hosted than SaaS, but we'll use (& pay for) free software over both of those options if at all possible.
As a hosting co we'd rather have self-hosted than SaaS, but we'll use (& pay for) free software over both of those options if at all possible.