I believe you already picked up a pair of DS Trainers - the lightest Asics STABILITY shoe 8.5 oz. Yes?
In comparison, the GT-2160s are a bit heavier. The GEL Kayanos are the heaviest of the three (at 10.4 oz.) All are STABILITY category shoes suitable for persons w/ low arches.
The Kayanos are "more shoe" and tend to be a good choice for heavier runners. Faster, lighter runners tend to do better in the GT-2160s (less shoe) or DS Trainers (least shoe).
Note also that DS Trainers feature a slightly lower heel than the other 2 models —preferred by some runners for everyday use, while others reserve their DS Trainers for speed work or races. That's mostly personal preference of course.
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