I'm not getting into a whos the harshest competition
Trial tech undrilled i cant comment on, never used or had experience with one. Trialtech sport imo isnt great and is essentially identical to Koxx.
In terms of someone flat spotting a echo urban twice on the first day, a rim is only as stong as the build.
I built mine myself and would consider myself better than average (i used to ride with beau and got alot of experience trueing and building wheels for him, as he went through at least one rim a week), so maybe the build wasnt very good? I also make an effort to ensure the spokes are tensioned equally after every few rides, or any big down gaps.
Essentially an urban built badly, would be worse than a single walled rim made of cheese metal built well.
Built properly in my personal opinion the urban is the strongest rim avaliable, and i know for a fact it will hold a dirty deep grind for ages.