If I had to pick one, the Jeffsy would be first, the Spectral second, and the Trance a distant last. The Jeffsy has excellent geometry and the Trance has very outdated geometry with the Spectral somewhere in between. Many 27.5 Mountainbikes have not been updated recently and are not up-to-date geometry wise. 29ers have been getting most of the updates in the last couple of years.
I live in Durango, CO where the mountains meet the desert which is a pretty good example of what riding is like all over the mountain and desert West. 29ers pretty much rule in Durango because 29ers roll over rough ground much easier. In addition, we don’t see many long-travel bikes. We have lots of steep and rough but our trails are so twisty turny uppy downy that you can seldom reach the speeds where long-travel performs best.
Instead of the bikes you selected, I’m going to suggest that you might be happier with an updated progessive geo 29er with about 130mm of rear travel. The Commencal Meta TR 29 with 130mm rear/150mm front travel would be an excellent choice. The Trek Fuel EX 29 with 130 rear/140 front would also be a good choice. If you really want more travel, get the 29er Jeffsy. In fact, you might be quite happy on a bike like the Norco Fluid FS 29 with 12o rear/130 front. Even though the fluid has shorter travel, the excellent progressive geometry and aggressive 29×2.6 tires more than make up for the lack of travel.