For those considering Comodo, I'd ask that you reconsider.
They tried to trademark LetsEncrypt:
https://news.ycombinator.com/item?id=11964583
https://news.ycombinator.com/item?id=11973232
Bad OCR led to certificates being issued to the wrong people:
https://news.ycombinator.com/item?id=12761248
They created their own Superfish-like adware: