cctlds Domains for Geo Targeting

I have a question:

My Customer is located in Mexico. Her Business provides services in Mexico to American people in the United Stated.

Meaning all the customers hire my client from US for a Service in Mexico (Destination Service).

Do we have to use .mx as domain or .com ?

.com ofc cause searches will come from USA and u not intend to rank for Mexico keywords . But setting Georgia target to USA in webmaster tools is much more important I think