What to develop: bran.afrecho.com or afrecho.com

[WillCast]

Hello,

I own Afrecho.com, it means bran in spanish.

I would like to develop the domain, perhaps a mini-site, focused on bran types, benefits, etc.

Which domain should I develop in order to get better SE ranking easily? The main one, afrecho.com or bran.afrecho.com?

Or... both? afrecho.com in spanish and the subdomain in english...

or...

Thanks in advance,