I've done both, more than a few times.
As his photos show, carb cycling is far superior for trainers like us.
You cannot train effectively on very low/no carbs... even on roids, it's not possible for long periods of time. You'll still be flat.
If you are a huge fattie, don't really care about muscle size/conditioning and desperately need to dump fat, Keto is probably the best way to go.