Pardon the newbie question. I tried to search the thread but couldn't find the answer.

I would like to use a tool like this one or ExpertFlyer. This one is less expensive. What, if anything, do you give up by using this tool instead of ExpertFlyer? I see ExpertFlyer mentioned often, but just stumbled across this tool today and it seems to show the same kind of information. However it doesn't seem to be mentioned as much. Is there a comparison of the two systems somewhere that lists the pros and cons of each one?