Hi,
there is a very helpful and informative web site called
http://www.webconferencing-test.com/ that compares 21 web conferencing / online meeting solutions in a transparent vendor-independent test. Web conferencing software has been rated in these reviews based on number and scope of features, user-friendliness, speed of online meeting setup, ease of software installation, cost, security, and overall system requirements. It certainly will help you select the most efficient tool.
Best regards