I have taken hundreds of church photos, so picking a "best" would be a challenge. There are a few that instantly come to mind, not because they were my "best", but because of what they mean to me.
For example, one of my all-time favorite churches is a small Episcopal church in Jacksonville, FL. This church is more than 150 years old, as I recall, and was moved from its original location in the wilderness, by barge and then truck, to its present location.
Some of my favorite churches are in Canada, like St. John's Anglican Church in Peggy's Cove, Nova Scotia. The village itself is very special to me, and the photo of the small church on a very foggy morning brings back good memories.
Another great memory is from Newfoundland's most westerly point, Cape Anguille. Since 1914, the Holy Trinity Anglican Church has held regular services for the hardy, sea-faring people of that harsh land. Plain on the outside, I found its interior to be very beautiful in its elegant simplicity.