We've only ever used 700 rims, and no problem. I think they may be a bit faster. Before the last tour I replaced the rear spokes to triple butted Swiss DT's. I broke a few before, but that was carrying most on the rear over some bad roads. Never broke a front yet.
I'm about 190cmX85kg on a 66cm frame bike. My wife never had a broken spoke yet as she is a lot easier on the gear and carries less gear. It's only fair.
I've seen the smaller wheels break spokes. Best to be able to fix your gear enroute. Stuff breaks along the way you can only dream of. Be prepared.
And do take spare spokes along. A good place is to stuff em down the seat stem with the cable ties, gods gift to cyclists.
The trips over the years were all on 700's
The Chile, Peru, and the salar de uyuni in Bolivia,
India (2 times)
Next year the silk road.