The one that works best for your swing.
We are often asked this question and really there is no meaningful answer. At any time any driver will work for some swings and not for others.
The important thing is that your golf club fitting matches the right driver and shaft for your swing that delivers the best performance in both distance and accuracy. It is important that your fitter has a wide range of driver heads and shafts from different manufacturers so you can always arrive at that peak club performance formula.
Single brand club fittings are unlikely to deliver that peak performance outcome. It is the understanding of the performance of many different drivers in combination with aftermarket shaft options is the key to a good club fitting.