For fun, found a few different watches from UTMB.
Vertix, Spartan Ultra, and a Fenix 6. Don't know anything about the watch settings (or specific fenix model) but both the Vertix and the Fenix were VERY similar. Both had some cut corners and some odd moments, although having never run the course it's tough to tell what happened.
Anyways, thought it was an interesting comparison. Vertix cuts some corners (as is typical of Coros watches) but you can definitely tell the Fenix had some artificial distance from some of the jaggedness. Splitting hairs at this point it would seem.
https://quantified-self.io/user/PlxFTqsLrOZdI7acfoZReZeg7q62/event/1pFIEzM7xZuO3HYDPvrs