IME, mixed-content warnings. Tracking down those can be a nuisance. If users can add inline images, you'll basically not be able to avoid these. Let's Encrypt

IME, mixed-content warnings. Tracking down those can be a nuisance. If users can add inline images, you'll basically not be able to avoid these. Let's Encrypt certs work on pretty much every device. (Some Comodo certs don't work on older Android, for instance - we hit this at work and switched those sites to Let's Encrypt, problem solved.)