Leon or San Miguel Migracion?

[jesm]

We worked with both offices, SMA is far, far less crowded and more efficient.
That said, your timing may not be the best as both offices will close around Dec 15 for holidays and not to reopen until 8-9 January. Starting around Nov 26 will not allow adequate time to complete process until office reopens after holidays.
My wife secured her Permanente in October thru SMA office and it was 5 weeks start to finish.
Either place has for-fee facilitators that can simplify, but not expedite, the process.
Sonia Diaz in SMA is a great resource should you want assistance. www.soniadiaz.com.mx