I'd probably go for the FTDI board over the cable simply because they tend to be a little cheaper. I also don't like the cables that have the individual wires because then you need to get the wiring right every time, rather than just making sure to plug a connector on to your Pro Mini the right way around. For the rare times when I need to break out the individual lines differently, I can always just use some jumper wires. They do have FTDI cables with a connector in the standard "FTDI header" pinout, so that's not an issue with all FTDI cables.
Other than that, either one will work the same. I do seem to remember that there were some FTDI cables without the DTR or RTS pin broken out, which means you would have to manually reset the Pro Mini to do an upload. I definitely would avoid buying those. However, after a quick search, I didn't see any of those around.