Best Pre Workout for Running and Spartan Race Training

I am training for a Spartan race later this year and my workouts involve a lot of running as well as functional strength exercises. I am looking for the best pre workout for this type of training. I need something that provides sustained energy for over an hour but doesn't cause any stomach cramps while I am running.

I am based in the US and I have found that traditional bodybuilding pre workouts are often too heavy for cardio. I am looking for something more endurance focused with electrolytes and maybe some BCAAs. I want to stay hydrated and focused through the mud and the obstacles.

What do you all use for your long distance or hybrid training sessions? I have seen some products from brands like Tailwind or Honey Stinger. If you have a specific pre race supplement routine please share it with me. I want to be at my best on race day!