I see the Mexico project as the quickest of the two tower projects to get financing.
We have known this already, but the press release again stated that condition two calls for the private landowner to give "assistance in securing the necessary Power Purchase Agreements (PPA's) in support of the financing for the Tower Project"... so there are three groups of people helping to go after the PPAs in Mexico - SWET, the private land owner and the local officials. It is better when all three groups have an interest in the project and are actively working to get the PPAs - especially in a foreign country where you would need more local support.
For the AZ project, although the land owner and the town will gain from the project, it looks like only SWET itself is going after PPAs, while the others wait for their money "if" the project happens.