The twin turbos on the whiteblock T6 are exactly the same size. It does generate a lot of low-down torque, but that's because both turbos are tiny.
As far as I'm aware, there is no benefit in feeding two identical turbos with half the number of cylinders each, compared with feeding one larger turbo with all cylinders, all else being equal. It's certainly miles away from the benefit of a sequential or compound setup.
The only marginal benefit might be that you get better flow in two exhaust manifolds, each with their own outlet, but then if you've seen the size of the outlets on the T6 manifolds...!
BMW went over to a single twin-scroll turbo (and a fancy manifold) on their turbo 6-pots - undoubtedly a cost-saving measure in the first instance, but it doesn't appear to have notably affected performance.
cheers
James
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