Regardless of COVID, or nothing to do with it at all. Nashville and the greater Nashville, area is one of the fastest growing areas in the US. I have spent some time there the past few years including as recently as the end of December. It will be an excellent place for a baseball team. Montreal on the other hand, had one of the lowest growth rates of major metro cities in NA a number of years ago. The demo in Montreal is not what is was from 68 to early 90s with the Expos.
Looking at it from a business stand point, a place players would want to play and live, fan base potential, I would say Nashville hands down!!