F-Secure vs. Panda in network environment

I am currently researching are anti virus needs and have narrowed it down to
these two (don't ask why, I just have!). I was wondering if anyone with
experience of these could give any advice/tips/comments. I am particularly
interested in the following:

- Microsoft Exchange features
- Central admin features - how good are they?
- autmatic updates - how often and how reliable?

And any other general comments.

Thanks,
ric.