You are using Latin - so Romanian. A wild guess is that Romanians have grammar somewhat similar to Italian which means they're grammar is on a "acceptable" level...that is: not as hard as german or french grammar but probably harder than English.

Romanian is a closer Language with its Roman roots.

The big part in learning is to be able to use and practise it. Local shops for example.

Probably Romanian since you will not have to learn a new alphabet.

Yeah both