From what the Venerable Ledi Sayaadaw says, it seems that Okappana saddhaa
is more stable and stronger than pasaadha saddhaa. I would equate it to
the confidence born of conviction, having made a thorough study of Dhamma
or having practised meditation. While pasaadha saddhaa would be the
confidence born of tradition. Pasadeyyaasi literally means `to make one
cheerful.'
I wonder whether it is not better to avoid the word "faith" altogether,
and to use "confidence"
(1) confidence through attainment (aagamana,saddhaa),
(2) confidence through realization (adhigama,saddhaa),