Yes, all of the SSL certificates we are offering are trusted ones. Both authorities COMODO and GEOTRUST have been in business for many many years, and their respective brands RapidSSL and PositiveSSL are accepted by literally every client (99.9 coverage!).
The exact type of SSL certificate is mainly depending on the technical requirements of your infratructure. In case you are uncertain, please don't hesitate - contact us and ask!
Please note that the installation for the SSL requires some technical expertise, therefor we highly recommend having the server administrator or website developer do the installation.