Master’s (Titulo Propio) from Universitat Autonoma de Barcelona?

[Messdiener]

From what I understand of the American accreditation scene, regional accreditation has often been seen as a higher level or superior standard.

If memory serves (and don't count on it!), you couldn't progress from a nationally accredited degree to a regionally accredited in years past. With some changes in US government regulations in recent years, this may not be as strict as in the past.

Likewise, depending on what country you're in, this may be totally irrelevant though.