Are you interested in an integrated system ? Meaning the cgms gets bg, sends to pump, and pump makes adjustments automatically, if that is turned on. But if you go with Dexcom cgms, it won’t talk to Medtronic pump (but in future will).
I recently switched to Tandem X2 pump, after 25 years using Medtronic pumps. Tandem is integrated with Dexcom.
However, I don’t rule out a future Medtronic pump integrated with Dexcom, expected within year or so, along with other integrated system choices.
Have you read this post?
https://forum.fudiabetes.org/t/medtronic-780g-first-4-weeks/