It doesn't matter what I would choose since my needs and security profile are 99% likely to be different than yours. But you are concerned with security or you wouldn't have asked the question and have tried both? Have you tried the latest version of OA? It has a free version and friendly support and can run in quiet mode. As to the OA dll question I see dll's in the program list and the start up list and can block any that I feel should be blocked so I question the accuracy of the source you provided. But you should simply trial the latest versions of both if these are your fixed choices and use the one that works best for you. Hope this helps.