A tunnel tent with fibreglass poles will rock and sway. A dome tent with crossing poles tends to twist. Perhaps a dome is the better of the two but then you lose living space. Some tents (Vango I think) have internal bracing straps to help prevent swaying but I think metal poled tents probably have the edge and particularly frame tents.
We've seen some very strong winds and gusts in our "family tent" size time, and our Vango Colorado dome withstood all of it no worries. Last week in Dorset I was watching tunnels pitched side on to the wind almost caving in and it made my mind up not to get one.
------------- "There are only 2 lasting things we can hope to give our children, one of these is roots, the other wings"
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