Comodo Dragon Internet browser (Chrome Alternative)
So, you can say Comodo dragon = Google Chrome + Better privacy and security.
It supports almost all versions of Microsoft Windows i.e. supports XP to windows 8. It can identify better ssl certificates from those which are not that much better. Google chrome track and save list of files you download but Comodo Dragon will not keep those for better privacy. It stops cookies and others like this to make sure that website cannot store anything on your pc (For better security and privacy).
Comodo IceDragon internet browser (Firefox alternative)
Like Comodo Dragon you can say Comodo IceDragon = Firefox + security and privacy.
IceDragond got siteInspector, with the help of which you can scan links before you give them a visit (Right click on link you want to scan and then click on Scan Link). You can also scan current page too. With IceDragon you'll also get comodo’s DNS servers for even better security. You may know Google’s DNS servers that everyone can use for better speed, in the same way comodo’s DNS will increase speed for loading Web Pages. If there is any kind of virus in a webpage DNS will filter that out and block harmful websites and WebPages.
Which one is better for you?
According to Comodo they developed both with better security and privacy and now it is fully up to you which one you want to use. If you like Chrome you should go with Comodo Dragon and if Firefox is the one that you like then you should get Comodo IceDragon.