I think Republic is better it is widely practiced all over the world. In republic ideology people elect their representatives through votes. Leaders work according to the constitution & rules. Populism is a less famous ideology & has been extinct almost. In Populism ideology unprivileged homogeneous group of people fight for their rights against group of elites who govern them.

For you ¿what mean a Government populist?

Buen día ;)

Good Morning

Yes :D