The ultimate chain for longevity are the nex X ring chains. They hold lube better than the round O ring chains and offer less power delivery loss. Anyone who thinks ANY chain doesn't need regular maintenance with some type of appropriate stuff is flat wrong, no matter the type of chain.
As for ultimate efficiency, a strong traditional non ringed chain delivers less drag and may allow you to marginally win a close type of race, although the difference is small against an X Ring racing chain with tremendous tensile strength and fresh soft sharp ring profiles. A couple break in burnouts help reduce drag on a new one, too. Don't try this as home, of course....
I always like the old style chains that were lubed with the old oily crap that used to fling thick dirty tarlike globlets all over the bike. After years of liberal driving and lubing, the whole bike was black as pitch and the rims, spokes, and engine looked like they had a nightmarish dull black paint on them. You could smell the bike coming from miles,and the hot surfaces if thick enough actually bubbled and sizzled and popped back at you while running hot...... and after being parked in old leaky barns for several decades they could be bought cheaply because they were so ugly.
Take them home and clean them off.... voila! A brand new shiny perfectly preserved bike underneath! It was even possible to determine the original color of paint! Another advantage is that when the bike became properly caked with sticky oily crud, many of the pieces that fell off got stuck and actually stayed with the bike! Tons of original hardware and absolutely original parts were retained in this fashion and acted as an extra buyer bonus for the restoratively inclined bike buyer.
Retention of the crud also allowed you to patch some holes in your asphalt, and rubbing it into your old tired black leather jacket or pants would make them look new again and restore some weather resistance.
A teenager or cheapskate with too much time on his hands could enjoy many benefits from primitive technology.
I will now apologise for dragging this serious tech topic into the humor section. Please excuse the hell out of me. Cheers.