I have >10 PC's with identical control PCB boards to modify. 115200 baud is fast enough. Just want to use a very easy to find USB to USB cable(like those used to connect a PC to a printer) to connect to the modified control board.
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Looks like there are two recommended best choices CP2102 and FT232RL
Which chip has the best easy to get it to work with no crashes/it just works driver?
Both are good, The CP2102
N is newest version of CP2102, but the FT232RL is now quite old. The FT231X is probably a more modern choice.
Get an Eval board for each one, and try them.
Does the package matter ? Will you be making your own PCB, or buying a interface module ?
If buying an interface module, you need to consider form factor and cable used.
USB-A is cheap in a module, but those cables are now less common.
eBay has many CP2102 modules, tho the eBay FT231X modules seem to be very silly prices - maybe they target someone who mistakes currency conversions ?
eBay has better prices on the older FT232RL parts