For me it doesn't matter anymore, got fed up by drivetrains quick wear / short life due to all the hassle related to it - I went singlespeed, then fixed gear, then I moved to a motorcycle chain (Regina Urban, a 420 model) which -does- last the time that was "normal" in days back.
And as soon I found out it working, I bought a stock of them for decades, which was before the 2020 economical sabotage, and thus at the "old" price. At the same shop I bought, these are now priced +30%.
I also purchased, earlier, a stock of an "inbetween" chain, the Gusset so-called "Tank" model, which differs being 3/16" wide instead of the motorcycles 1/4", which also proved a longer life, but the motorcycle chain outperformed it, possibly due to the pins a tad thicker (I had toi drill out the hole in a chain tool to 4 mm) and thus bigger mating surface.
I decided to first use up the motorcycle chains because these come with some white grease instead of oil - and showed rust spots even in their original packaging, a kinda glossy butter paper.
Also, some black powderish particles appeared in the grease, alike the chain or grease was contaminated with some particles that oxidized during storage.
The 1st thing I do is wipe off as much as can the grease and dust, then motoroil on it, then ride, then wipe off another time.
The grease is so "sticky"? that a new chain hangs like a zigzag, lord knows why Regina chosed it.
It doesn't lubricate, it doesn't prevent rust, rather the opposite, it exhibits more of a grinding paste to accelerate than to decelerate wear.
That's why I decided to use the motorcycle chains up first.
