What are some alternatives?
When comparing GeoTrust and Comodo, you can also consider the following products
Digicert - Encryption & Authentication
GlobalSign - GlobalSign offers a range of SSL Certificates with the strongest 2048 bit encryption and value add features to ensure your website is protected.
Let's Encrypt - Let’s Encrypt is a free, automated, and open certificate authority brought to you by the Internet Security Research Group (ISRG).
GoDaddy - GoDaddy makes registering Domain Names fast, simple, and affordable. Find out why so many business owners chose GoDaddy to be their Domain Name Registrar.
VeriSign - VeriSign Authentication Services provides solutions that allow companies & consumers to engage...
RapidSSL - Buy, switch and resell RapidSSL Certificates. Wildcard SSL Certificates also available from the leading data security software provider at low-cost.