A few days ago I wrote about free access to Irish Catholic parish records on Find My Past. These records are also availble on Ancestry,

In my experience to date I prefer the Ancestry Irish Catholic parish records. I have found a few new members of my extended family via the Ancestry Irish Catholic parish records. The records seem more complete, although that may or may not be true in general, it seems to be the case for my family.

I also like that the Ancestry index seems to be more often linked to an image of the actual record. That may be of limited value since the records are written in Latin and often hard to read. But it is nice to se the oriinal record and verify that it was indexed correctly. (I have not found a mistake yet.)