Best is the full citation--the link is nice, but an added perk. If someone printed out the profile and handed it to me, I should be able to find the document offline.
Websites come and go, but a national or state archive is generally stable. I should be able to walk or write to a church with that information and have them find the record.
Sure the church or archive may burn, but there should be the alternative, esp. when the online linked info is just a transcription.