I like the 3G better for a couple reasons,
#1 it's still a ford part haha
#2 they are very easy to wire up. Of the 4 required wires only 2 come off the alternator. ( charge cable and exciter wire)
#3 they can be had for dirt cheap at any JY.
#4 it's a stock part, so if your ever out on the road you can find a replacement easier.
#5 they put out more amps.