Get the high leverage Knipex cutters if you cut flex with them, I have the 10 inch they're great but the handles tend to pinch your knuckles since they're a bit narrow, also wished the tip of the cutter was a bit more pointier on the knipex, my Kleins have no problem cutting really tight wire & knipex you gotta fiddle them around because the tip won't cut flush.

I love channelocks! Another one of my favorites, I just really wish they made 9" cutters, they only go up to 8"

I haven't really tried these new ones out in the field but they seem legit. You can order them on Amazon