Only doing the 100 myself, forced onto the road bike due to still not repaired cruzbike post accident. But, given the choice, I'd probably still choose that on Saturday. As yanto says, its the sudden gusts going past a hedge gap, or turning a 90 degree corner cross wind. I find the steering corrections less twitchy on the road bike.
I got caught in a big thunderstorm in the fens on the cruzbike, wind first before the rain, went from nothing to throwing me over the other side of the road in the space of about 500m. Unpleasant, risky, hyper vigilance required due to cars still driving past like twats. Unfortunately nowhere to shelter.