Polonia /
Which country is better SPAIN or POLAND [118]
which language do local people speak today in ex-Spanish Latin America?
Lots... in addition to official Spanish lots of indigenous languages and cultures are thriving (far more so than in NAmerica) there are also immigrant languages (preservation of which tends to vary from country to country, I remember my university in the US had a subscription to an Argentinian journal published in Ukrainian...) and new languages (creoles) not to mention sign languages (which probably number in the dozens).
The establishment of Spanish in the Americas though all levels of life is one of the most remarkable linguistic facts in recorded history - in many ways much more interesting than the spread of English since it was less tied to purely.... economic considerations and more deeply culturally based.
(In Africa the spread of Swahili over the last few hundred years is similarly remarkable).