Good luck with the KTM! Although, I must say, this generation KTM are not famous for long term reliability. I hope your riding partner is a good mechanic. Be sure to carry a full set of spare parts for this engine.

If me, I'd start with a fresh top end rebuild before departure. New head, valves, valve gear. They generally only last 10K miles (15K kms) before needing service. Use the best synthetic oil you can find. Do not over-Rev or lug the engine. With luck you'll go 25K kms. without problems.

Clearly, the KTM is the best on your list for OFF ROAD riding ... but the worst ON ROAD. If you plan to ride over 50% off road then a good choice. I'll bet not more than 30% off road. Most do 80% Road, 20% Off road. YMMV.

You must be a tall girl as the KTM is tallest of all the bikes on your list. Also, not the best for carrying panniers. Weak sub frame will require custom modification to last on a long tour.

In my long term testing of this bike one thing stands out most: VIBRATION.

This generation KTM will vibrate the fillings out of your teeth!
Vibrates more than any bike I've ever ridden. (hundreds)

A super WIDE and well padded custom seat will reduce vibration, and make the KTM better on long highway riding. Also, Alu handlebars and padded hand grips can help reduce vibration too. Good boots with THICK soles a must to keep legs from going numb.

Try to find the "sweet spot" (RPM wise) when riding highway. Ride at that RPM when possible to reduce vibration. Off road the KTM is a delight. Nothing better in the class. You hardly feel the vibes because you are having so much fun!

But as a Novice, first time rider, I doubt you will understand or be able to appreciate any of this at this early stage. Maybe in a year of riding and comparing to other bikes you'll see just how good your KTM is for OFF ROAD. (and how bad for long rides on highway! )

Good luck and all the best!