Exchange fellow Jetze Mellema blogged (in Dutch) about a useful online check, which will allow you to check your current client – computer or smartphone – against a set of certificates from different vendors. The short – and more memorable and mobile friendly – URL for this test is as follows: http://m.ssltest.net.
The creator, SSL reseller FairSSL, also keep a total overview, which is located at http://www.ssltest.net/compare/sar.php. Note that the table’s titles are hard to read, but when hovering above the cells the corresponding product will be displayed.