Hard to say. For a very, very devout Catholic, I think the Portugues would be my first choice for a final 100 km. Purely because Padron is so closely associated with St. James and, for a devout Catholic, St. James is why one is going to Santiago de Compostela, after all.
If the Portugues is out, it's hard to say. You are probably looking at one of three options: Frances from Sarria, Ingles from Ferrol or Sanabres from Ourense. Each has its pros and cons. Full disclosure, of the three I have only walked the Frances.
Frances from Sarria has a lot of infrastructure to support pilgrims, has a lot of history as a pilgrimage route, has a lot of pilgrims and pilgrim groups.
Ingles from Ferrol gives you a "complete" Camino, a growing number of pilgrims, and some nice variety.
Sanabres from Ourense is the one I've heard the least about and probably the least travelled. But what I've heard has been very positive.