It always comes down to your long term goals and how the individual that owns the car wants to drive it. Same goes for any modification, wheather it be turbo's, cams, ecu, exhaust. Its a balance of parts that must work together to achieve a result, and in the end its all in the hands of your tuner anyway.
Ive tuned haltech's, wolfs and FC's in a variety of cars now and they all have their pro's and cons. All ecu's have some advantage over the others. It comes down to what suits your goals and engine recipe the best, and what your tuner can produce your desired result with.
Ive yet to play with a vipec. The ecu was designed/developed by a local (Cairns) resident thats been into ecu's and turbo's for many years. They started out turbocharging landcruisers for toyota and developed toyota's sahara model. More recently was the Autronic, and they are one of the largest Garrett dealers in the country.