[DanielGarneau]

Haytem,

I am currently seeking information on the same subject. This morning I posted a few related questions on this forum. Tonight I found part of the information I needed in a WordPress Codex titled "Multilingual WordPress". It gives the pros and cons of various approaches to bilingual or multilingual sites. Using a subdomain such as esp.xyz.com and using a pattern such as .com/es/ are listed there.

From what I can understand, any of these two scenarios you mentioned in your post would be the simplest way to set up a bilingual or trilingual site. The only drawback mentionned on that WordPress codex is the maintaining of two or more individual sites.

The advantage I see is that your Spanish and your English content would both be in a stand alone site, with their own database. Plugins can be experimented with and used to allow users to switch from a language to the other.