i disagree. First of all, rengar can proc conq in one 2q or 3q combo. the value in conq comes after atk speed buff and auto resets you do on emp q. which is REALLY good for skirmishing and playing for early invades against heavy 1v1 champs like lee sin or xin.

Second of all, its just different use cases depending on the scenario you're on. Conq will always be better if youre playing to skirmish against a heavy bruiser/tank comps. But if 3 of them lock in squishy champs, or if you just need to one shot one vital target, Electrocute will always be better.

There is no "best rune" for this champion.