From my experience I would say the best chains are whipperman – the stainless steel ones – as these are durable and strong.
That being said, they are essentially a consumable, so I don’t pony-up for the more expensive ones.
I go for two SRAM cross-step chains in rotation:
https://www.sram.com/sram/mountain/products/sram-powerchain-991-cross-step
These are proper strong. Having two in rotation improves the durability of the cassette and chain-rings as they don’t wear-in to each other.
In terms of care, I take them off, dump in white-spirits, wash and dry. Then lots Rock’n’roll extreme.
Works well on the whole. I think it is best to view chains as consumables, like bearings, or [to a lesser degree] tyres. That way you are less invested in them when you inevitably have to bin them.