I would go with the whiteboard since overall I think it's more conveinent than a blackboard.
I've found that the colored markers seem to write better and are easier to clean off than some of the colored chalk.
Chalk has a habit of getting lost/misplaced/taken so it doesn't seem much better then the markers. Yeah, they can dry out but if you keep a few around it's not that bad. Just hope you don't keep getting people writing on the board with ANY marker they find laying around, otherwise keep a can of acetone around to clean the board of permanent marker, like we have to do at times at work.
We changed the style of some of the light diffusers in the flourescent fixtures and glare doesn't seem to be a problem anymore. This isn't always a problem, it just depends on where the board is mounted in relation to lights and windows. I have seen some shiney blackboards where glare was a problem, either because they have a shine to the finish to begin with or because some people like to coat them with lemon oil.