In the Canterbury Tale who is the more devout christian based on direct and indirect characterization the Nun or the Parson?

The Parson is the more devout Christian. He lives in poverty but he I also very holy. He is not selfish and he "truly knew christs gospel and would preach it devoutly to parishioners and teach it". He is everything the Monk, Friar, Pardoner, and Nun are not.