Melnyk runs circles around Katz if winning is the standard (which is 99% of what I care about from an owner). The Sens have won 6 playoff rounds (including a trip to the finals) during Melnyk's 15 year tenure. They made the playoffs 9 out of 15 years, which is 60% of the time.
Under Katz the Oilers have won 1 playoff round and made the playoffs once out of 11 times, a 9% success rate. Katz also had a much more loyal market base, more personal fortune, and more income and revenue.
Katz is the worst owner, it would take a twenty year playoff streak for the Oilers to say they made the playoffs 60% of the time under Katz. Think about how bad that is, an entire decade without playoffs (in a league where 53%+ make it) is legendarily bad. The odds of flipping a coin and getting heads ten times in a row is 1/1024.
We won't see an owner have a worse competitive streak than Katz for a long time, perhaps ever. Only a handful of markets could sustain that woeful level of play without going out of business, and hockey crazy Edmonton is one of them.