For me this is complicated if we're limiting it to roomettes.
I normally travel with my wife and we both dislike the in-room toilet of the Viewliner I's. She's a nurse and I've watched Mythbusters enough times so we both know that it's impossible to use a toilet without spreading germs all over the room. You're basically sitting in pee and poop. Plus, you have to be REALLY close to someone to use a toilet in front of them. So we end up using the shared toilet in the hall anyway. So in that sense, I prefer the Superliners with no in-room toilet and multiple shared toilets.
However, I do feel extremely claustrophobic on the top bunk of a Superliner roomette.
I think the Viewliner II roomettes with be the best of both worlds.