The newest SHIELD TV makes a couple of changes to the formula that will earned the original a spot because the uncontested king of Android TV. It’s smaller, easier, and comes with new components. The “updated” SHIELD Pro is a bit less evolved. It could still the same size factory-like, and it’s shipping with the older SHIELD Remote. That could be an advantage or minus, depending on your perspective.
The initial SHIELD Pro bundle did not include a remote at all (neither did the regular one).
PSA: The new NVIDIA SHIELD Pro still ships with the old remote was written by the awesome team at Android Police.