Pre workouts on <6 net grams carbs

So, when it comes to stim and non stim pre workouts, what does everyone have experience with? What are the best pre workouts to use that are stim based and non stim based? Gorilla Minds and Black Stone Labs pre workouts are the most prominent in my searches so far. Thoughts on these? I'm looking for 4 solid pre workouts that I can rotate from.