The FI will run the generally best and with better gas mileage. The carbed version is by far the easiest for Joe Average guy with some minimal amount of mechanical knowledge.

The FI version can be OEM from a donor car like a Mustang or stand alone after market like a Holley, FAST or Edelbrock, etc. You do have a fair amount of additional wiring and need to add 2 to 4 oxygen sensors in the exhaust (single or dual exhaust). You will need a high pressure fuel system complete with a return line. Then of course, if it dies in West Overshoe on a Saturday evening, the local garage probably can't fix it nor do they have parts if luckily they do have the knowledge as they need to come from the manufacturer.

Now, with that said, your daily driver probably has FI, but it was supplied by a manufacturer, probably didn't sit in a salvage yard in the weather waiting for a lucky guy to come along and buy it. Your DD probably wasn't in a totalling wreck either in which other nasty things could have happened.

Now, with that said, I'm considering converting mine to FI in the next year or so, but.........