Fanless SP4 + Surface Mini or Toshiba Encore Write would be my travel companion. Light package, a large canvas and a note-taker , perfect for both usages. I am once a fan of a clam-shell keyboard, but the SP3 typer cover is so much improved to neglect that part. I also seldom use my SP3 on the lap. I guess all comes down to whether one is sold on the Surface type of device. It is just so much more flexible than a clamshell type device IMO.