Tundra Wilderness vs. Kantishna Tour ???
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Denali Shuttle vs Princess Kantishna Experience
Hope you find what you are looking for.
I recommend you look at www.nps.gov/dena and find out about the Eielson SHUTTLE bus. If bears are your priority this is what you should be considering and not the TWT. It is very likely to see bears, but for the first time, I was skunked on an Eielson shuttle bus last year for bear sightings. Returned the following week for a Wonder Lake bus, and did see bears in the Toklat/Eielson section.
If you don't have a clear day, you can always drop off at Eielson and take a nice hike. They actually shut down the trails when we were there because there was a bear just down from the center, who was kind enough to entertain us for quite a while!
I would say take the earliest shuttle you can stand. Get going bright and early and leave yourself the most options. You can stay with the same shuttle all day, or get off for a hike and catch the next one that comes by.