I take the same size in both, the screens have a more 'compressed' feel to them, I prefer them as they don't slip down my cyclist arms like the classics do. Rapha offer free returns so you can always give them a go and send back if you don't like them.
I have the same problem with the classic arm warmers, too loose at the top.
I guess they're aware of the problem, hence the recent give away (with a jersey)
I take the same size in both, the screens have a more 'compressed' feel to them, I prefer them as they don't slip down my cyclist arms like the classics do. Rapha offer free returns so you can always give them a go and send back if you don't like them.