While I have seen people use both of them, I mostly prefer Red Claw as it’s somewhat more clear to read compared to the other one, in my opinion. I believe I’ve only ever seen Redclaw used in fanfiction or few standalone posts on the forum. Other than that I haven’t run into the former that much. The spelling in the first one does bother me enough so that I don’t use it, but it is not something I will fret over too much. At the end of the day, people go with what they decide suits them the most.