The difference is how the system changes, and what you can do with the ERP you already run.
In Tangle, plain-English change is live in customers' systems today. You describe what you need to Milo, Tangle's built-in AI engineer; Milo builds it inside your Tangle, in a sandbox, you preview it, and it is applied once someone on your team approves it. Every request is tracked on a board, so you can see what was asked for and what went live.
Fulcrum's AI works on Fulcrum data. We found no way to use it on a shop's existing ERP. That is the gap Tangle Xray is for, if your system is a fit. And if you decide to move, Off Ramp runs your old system in parallel while its data syncs into Tangle. You do not have to commit to a full switch up front.
For fab shops, see metal fabrication ERP and job shop scheduling.