The three Nations that compromise Super Rugby have continuously occupied the top 5 spots since before anyone can be bothered remembering. For the majority of the time, that's the top 4, if not the top 3. 100% of current All Blacks and Wallabies play in Super Rugby, as do about 70% of the Springboks.
Following on from that, the travel is the biggest of pretty much every non international comp. An Eastern State Side travels the distance of European countries 3 times a season, plus the equivalent of a return flight from London to Moscow, just within the conference. Then 2 trips to New Zealand and a tour of South Africa.
Next season, the Force make 3 of those LON/MOS flights, plus a tour of New Zealand and one of South Africa, within a period of 18 weeks!
To deny that Super Rugby is superior to European Rugby is like being a "climate skeptic". You're entitled to that opinion, but the facts, and anyone with a modicum of sense, disagree with you.