MONO RIG vs EURO NYMPH: What’s the difference- Which is better?

Both the mono Rig and ESN (Euro Style Nymphing) fall under the umbrella of Tight Line Nymphing. Both utilize long leaders suspended above the water’s surface for a better dead drift, with less drag than a floating line set up- Often referred to as “High Sticking.” But what’s the difference between the two systems, and which is better?