The part-time 4WD of the trail is "ok" for icey and snowy conditions but is better suited offroad.
Bull.
When you put a part-time 4WD system in 4WD, the front and rear driveshafts turn at the same speed.
When you put a 4Runner Limited's 4WD system in 4WD AND lock the center diff, the front and rear driveshafts turn at the same speed. There is no difference offroad between the two. None. Nadda. Zippo.
The Trail Edition has a locking rear diff, available KDSS, and better angles, so it is better offroad than a Limited. But those advantages have nothing to do with the lack of a Torsen center diff.