Personal opinion will way in here but I am not all too impressed with the Holley FI systems. I have tried them in the past and tuning was quite difficult especially when running a performance camshaft. Not that you won't run into this problem with a afi system. The biggest benefit to running the afi system over the Holley system is spark control. Holley does not sell a distributor with their systems so you are only getting fuel control. Afi systems also use quite a bit of 'off the shelf' parts so in case a part goes bad you can easily purchase any replacement parts at your local autoparts store.