UFGators2007

I'm creating portuguese and spanish version of a website. SEO-wise should I use a subdomain or a ccTLD (country code TLD) for portuguese:

br.yourdomain.com OR
yourdomain.br

And for spanish, should I use one subdomain like
es.yourdomain.com, or ccTLD for the most trafficked countries (according to my analytics), like

mx.yourdomain.com (mexico)
ve.yourdomain.com (venezuela)

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