Also in simple words grid has larger area to collect the signal and focus it to the feeder. and hence signal is stronger. It would surely give 2-3 dbi better signal than a panel and that means almost 50-60% more power. Do it yourself and you will know the best you want with the kind of terrain u r in.
That's too simple.
A grid of the SAME size as a panel MIGHT give bigger gain. But it depends on the exact design of both the grid and the panel antenna what the end result is.
Grid, or dish, panels have better resistence against unwanted signals from non focal directions but nowaday some panel antennas alse give very good results in these (Reduced side lob antennas).
Where gain on dish or grid antennas mainly is the result of the sheer size of the antenna a panel antenna also gains more when bigger.
Saying a 'grid' is better than a 'panel' is therefore is something like stating that one car drives faster than the other..... It all depends on the design.
The only definite pro of a grid compared to a panel is the windload. That is for the same size definately lower on a grid.
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Rudy R. Puister
WISP operator based on MT routerboard & ROS.