At least to me, the Gladiator
At least to me, the Gladiator is too niche, and really appeals for the more serious off roaders. At the price they are charging- very high, and with its unexceptional V-6, I am surprised that it had the sales that it did. I really wanted a more up to date Comanche, at a more competitive price, which would have greater appeal. After the few Jeep faithful clamored for the initial Gladiators, the sales dropped.
I kind of like the Ranger, and it starts affordably, although the platform shows its age (kind of out of date) in the steering and handling dept. In some ways, the Ranger makes a good argument for the F-150, which is superior in most ways for only "A little more."
The Tacoma sells based on reliability. For the price, it is not all that exciting in the end, and needs a better tranny.
Really, I would just want a smaller truck than any of these midsize offerings (that approach the size of the last gen full size products). I look forward to Ford's compact truck coming soon.