Microphones for conferences are quite different. There are gooseneck microphones that are placed in front of every participant involved in the discussion; boundary microphones that are placed on the table to improve the acoustics of the whole room; and, finally, wall-mounted and ceiling-mounted microphones. All of these types of mics have their advantages and drawbacks.
Here you can find some good options and their short reviews.
As for Rode, Audio-Technica, they are also good variants. I like these ones:
Audio-Technica AT875R
Rode NTG2
Sennheiser MKE 600