The verdict
If you need to collect information from customers, applicants or colleagues, pick Fillout. If you are an engineer building an agent or app that acts across many third-party accounts, pick Pipedream.
If you wanted a place to connect your own tools, look at Zapier, Make or n8n. I would not start a new automation project on the old Pipedream Workflows product. Fillout has a webhook and an API for the hand-off.