Welcome to the Forum from NH.
Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.
If you purchase a Tahoe, I hope that you will become a participating member in the Forum's discussions.
You've received good advice already from folks here, and the choice will come down to how much you are willing to roll the dice on the '21 to become part of the consumer testing and defect finding process associated with a new model year vehicle. And, while almost everything will be under warranty, the warranty never covers inconvenience and the disruption to daily life activities, when something goes wrong. So, how much daily life disruption are you willing to risk?