SwiftKey. Yes, I hate it being from Microsoft. But has most of the pros already mentioned in this thread and a some important features (for me) that I haven't found with other keyboard:
I text a lot in Spanish, Portuguese and English; sometimes in French. I can use any of those languages with any preferred layout (qwerty, azerty) or as I do, Spanish layout as a base but from there, I get all characters needed to write properly such as ñ, ç, æ, ê.
Prediction is outstanding, I can start a phrase in one language and continue with other and still get very accurate suggestions. It has been my default keyboard long before Microsoft acquired the company and, for now, big corporate enshittification has been slow. En conclusión y para sumarizar: j'aime bien le SwiftKey clavier, ele tem funções que nenhum outro tem.
Anything from Jorge Luis Borges or Júlio Cortazar. Doesn't matter the subject, it's Spanish dancing and taking forms while you read.