Well given that there is just about nothing available yet for FI, I would say go with bolt-ons until there is a good SAFE FI kit available. This will probably take at least a year or two. I would not want to be one of the first cars with FI only to have engine damage...just not worth it for me.
2012 Audi R8 V10, 6MT, Suzuka Gray, Capristo X-Pipe, Klassen M52R, GMG springs, GT tails, GT wing, Cosmetic mods
2015 BMW X5 35d, Mineral White
2016 MB C63S, Steel Grey
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