Contentful vs IBM ECM

Hi StackSharers, your help is dearly needed as we're making a move to which we will commit for the next few years.

Problem: As our Marketing team gets growing needs to publish content fast and autonomously, we're trying to add a CMS to our stack.

Specs:

• This CMS should have fairly advanced marketing features: either natively built, and/or be open source, so we can either find third parties' plugins suiting our needs or build our own plugins homebrew.

• "Advanced marketing features" like these: Non-devs should be able to handle content autonomously, Should have a non-dev friendly interface, should allow creating a library of reusable components/modules, should show the preview before publishing, should have a calendar with all publications, should show the history/tracking, should allow collaborating (Google Docs like), should display characters limit optimized for SEO.

Solution: We're considering an SSG + Headless CMS combination. We're fairly confident for the SSG (Gatsby), but we're still uncertain which CMS we should choose.

Hi Community, Would like to ask for advice from people familiar with those tools. We are a small self-funded startup and initial cost for us is very important at that stage. That's why we are leaning towards Sanity. The CMS will be used to power our website and flutter cross-platform mobile applications.