They are on Par. Excellent either way. I've got favorites where one is available from both. For instance, IF1 is much stronger then FenLB. I like IF1 but some people cannot stomach it (excuse the pun) and I recommend FenLB.
Cayenne - Christopher's is much stronger but Schulze's is a blend - someone else might prefer that.
You will not go wrong with quality with either one.
Great story. I was hearing that Christopher's Cayenne wasn't as strong as it used to be. I called my buddy over there and she said - tell them to send it back. It turned out they had a weak batch of cayenne pepper and therefore the tincture turned out weak. They exchanged it bottle for bottle! 4 stars.