if i understood correctly, you want to know which company existed before the current one, in mining?
you is near. which company existed before if existed , similar bit-x and hashnest ? before was similar company such us bit-x and hashnest if nowaday this company is best and never will destroy ?
this i know.
example: cex.io Existed for a long time
Easy to understand.
If you're looking for a pool? To mine with? Any pool is ok as long as you don't keep btc with them.
If you're asking for a trusted hardware provider? Bitmain should work.
If you're asking about a company's history? Hashnest sure. However hosted mining has not been profitable for many.
I have had dealings Bitmain and is a good vendor of hardware.
I have no experience with bit-x