Not necessarily.
Uruguay is not a big country and the performance improvement would not compensate for the cost difference.
We (I'm Uruguayan) had Droagonflys till now and that was sufficient (kinda) for the needs of the country.
Training, Air Police, control of resources and interception of low flying, slow, drugs carrying planes would be the tasks the new aircrafts would have.
Right now, the most important resource Uruguayan air force lacks is a radar. Even, Carrasco, our international airport hasn't a decent, reliable, functional radar.
Uruguay needs, at least, three of them.
Six or eight (I really don't think our population would approve the acquisition of more than that) L - 15's and three radars would represent a leap of technology, resources and results compared to our recent reality.