Lets say i move 1 btc with 1sat/byte

Then 2 people simult. Broadcast a trx with 100 sat/byte, how does the miners deter who/which transfer will beat the system?

If you dont know and just want to speculate then just dont bother

Looking for links to tutorials how to set those up.

All help appreciated.

(Yes I know they are old and not profitable, but this is a research project)