I don't know much about work visas, but 2-3 Canadian folks I know hold or have held H-1B visas.

Reading this page[1], which was the top result after maybe three seconds of Googling, indicates that holders of TN visas cannot have "immigrant intent," which many of my acquaintances do.

[1] https://lightmanimmigration.com/tn-visa-or-h-1b-visa/